diff --git a/.travis.yml b/.travis.yml
index f806412..0cbb1e4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-- 'node'
+- '8'
 - '7'
 before_install:
 - npm install -g npm codecov greenkeeper-lockfile@1
diff --git a/package-lock.json b/package-lock.json
index b0996e2..8c96dee 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,109 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0-beta.32",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.32.tgz",
+      "integrity": "sha512-EVq4T1a2GviKiQ75OfxNrGPPhJyXzg9jjORuuwhloZbFdrhT4FHa73sv9OFWBwX7rl2b6bxBVmfxrBQYWYz9tA==",
+      "dev": true,
+      "requires": {
+        "chalk": "2.3.0",
+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.0.0-beta.32",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.32.tgz",
+      "integrity": "sha512-ysfIt7p72xm5fjSJsv7fMVN/j+EwIdqu8/MJjt6TqB4wM2r6rFRi0ujBTWDkLGQkRB/P5uDV8qcFCHAHnNzmsg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "7.0.0-beta.32",
+        "@babel/template": "7.0.0-beta.32",
+        "@babel/types": "7.0.0-beta.32"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.0.0-beta.32",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.32.tgz",
+      "integrity": "sha512-bm7lIlizycJQY5SJ3HXWJV4XjSrOt1onzrDcOxUo9FEnKRZDEr/zfi5ar2s5tvvZvve/jGHwZKVKekRw2cjPCQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "7.0.0-beta.32"
+      }
+    },
+    "@babel/template": {
+      "version": "7.0.0-beta.32",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.0.0-beta.32.tgz",
+      "integrity": "sha512-DB9sLgX2mfE29vjAkxHlzLyWr31EO9HaYoAM/UsPSsL70Eudl0i25URwIfQT6S6ckeVFnFP1t6PhERVeV4EAHA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "7.0.0-beta.32",
+        "@babel/types": "7.0.0-beta.32",
+        "babylon": "7.0.0-beta.32",
+        "lodash": "4.17.4"
+      },
+      "dependencies": {
+        "babylon": {
+          "version": "7.0.0-beta.32",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.32.tgz",
+          "integrity": "sha512-PvAmyP2IJEBVAuE5yVzrTSWCCN9VMa1eGns8w3w6FYD/ivHSUmS7n+F40Fmjn+0nCQSUFR96wP0CqQ4jxTnF4Q==",
+          "dev": true
+        }
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.0.0-beta.32",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.0.0-beta.32.tgz",
+      "integrity": "sha512-dGe2CLduCIZ/iDkbmnqspQguRy5ARvI+zC8TiwFnsJ2YYO2TWK7x2aEwrbkSmi0iPlBP+Syiag7Idc1qNQq74g==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "7.0.0-beta.32",
+        "@babel/helper-function-name": "7.0.0-beta.32",
+        "@babel/types": "7.0.0-beta.32",
+        "babylon": "7.0.0-beta.32",
+        "debug": "3.1.0",
+        "globals": "10.4.0",
+        "invariant": "2.2.2",
+        "lodash": "4.17.4"
+      },
+      "dependencies": {
+        "babylon": {
+          "version": "7.0.0-beta.32",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.32.tgz",
+          "integrity": "sha512-PvAmyP2IJEBVAuE5yVzrTSWCCN9VMa1eGns8w3w6FYD/ivHSUmS7n+F40Fmjn+0nCQSUFR96wP0CqQ4jxTnF4Q==",
+          "dev": true
+        },
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        }
+      }
+    },
+    "@babel/types": {
+      "version": "7.0.0-beta.32",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.0.0-beta.32.tgz",
+      "integrity": "sha512-w8+wzVcYCMb9OfaBfay2Vg5hyj7UfBX6qQtA+kB0qsW1h1NH/7xHMwvTZNqkuFBwjz5wxGS2QmaIcC3HH+UoxA==",
+      "dev": true,
+      "requires": {
+        "esutils": "2.0.2",
+        "lodash": "4.17.4",
+        "to-fast-properties": "2.0.0"
+      },
+      "dependencies": {
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+          "dev": true
+        }
+      }
+    },
     "@digix/tempo": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/@digix/tempo/-/tempo-0.2.0.tgz",
@@ -16,15 +119,6 @@
       "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
       "dev": true
     },
-    "abstract-leveldown": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-2.6.3.tgz",
-      "integrity": "sha512-2++wDf/DYqkPR3o5tbfdhF96EfMApo1GpPfzOsR/ZYXdkSmELlvOOEAl9iKkRsktMPHdGjO4rtkBpf2I7TiTeA==",
-      "dev": true,
-      "requires": {
-        "xtend": "4.0.1"
-      }
-    },
     "acorn": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.1.2.tgz",
@@ -78,9 +172,9 @@
       }
     },
     "ajv-keywords": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
-      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
+      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
       "dev": true
     },
     "align-text": {
@@ -101,9 +195,9 @@
       "dev": true
     },
     "ansi-escapes": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-2.0.0.tgz",
-      "integrity": "sha1-W65SvkJIeN2Xg+iRDj/Cki6DyBs=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.0.0.tgz",
+      "integrity": "sha512-O/klc27mWNUigtv0F8NJWbLF00OcegQalkqKURWdosW08YZKi4m6CnSUSvIZG1otNJbTWhN01Hhz389DW7mvDQ==",
       "dev": true
     },
     "ansi-regex": {
@@ -113,10 +207,13 @@
       "dev": true
     },
     "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz",
+      "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
+      "dev": true,
+      "requires": {
+        "color-convert": "1.9.1"
+      }
     },
     "anymatch": {
       "version": "1.3.2",
@@ -128,22 +225,6 @@
         "normalize-path": "2.1.1"
       }
     },
-    "aproba": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.1.2.tgz",
-      "integrity": "sha512-ZpYajIfO0j2cOFTO955KUMIKNmj6zhX8kVztMAxFsDaMwz+9Z9SV0uou2pC9HJqcfpffOsjnbrDMvkNy+9RXPw==",
-      "dev": true
-    },
-    "are-we-there-yet": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz",
-      "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
-      "dev": true,
-      "requires": {
-        "delegates": "1.0.0",
-        "readable-stream": "2.3.3"
-      }
-    },
     "argparse": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
@@ -230,15 +311,6 @@
       "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
       "dev": true
     },
-    "async-eventemitter": {
-      "version": "0.2.3",
-      "resolved": "https://registry.npmjs.org/async-eventemitter/-/async-eventemitter-0.2.3.tgz",
-      "integrity": "sha1-959IDf2mZFqXvWFCwBcVDWO05w4=",
-      "dev": true,
-      "requires": {
-        "async": "2.5.0"
-      }
-    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -248,695 +320,55 @@
         "chalk": "1.1.3",
         "esutils": "2.0.2",
         "js-tokens": "3.0.2"
-      }
-    },
-    "babel-core": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.0.tgz",
-      "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
-      "dev": true,
-      "requires": {
-        "babel-code-frame": "6.26.0",
-        "babel-generator": "6.26.0",
-        "babel-helpers": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-register": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "babylon": "6.18.0",
-        "convert-source-map": "1.5.0",
-        "debug": "2.6.8",
-        "json5": "0.5.1",
-        "lodash": "4.17.4",
-        "minimatch": "3.0.4",
-        "path-is-absolute": "1.0.1",
-        "private": "0.1.7",
-        "slash": "1.0.0",
-        "source-map": "0.5.7"
-      }
-    },
-    "babel-eslint": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-8.0.0.tgz",
-      "integrity": "sha512-tN1B3adZ3tw8pr9oGsZ18iKCbdKBSvsn9ab6cGdbED+61LpGLhIVcf76eh59XejbdRLTBe+OYezxmYIaTgPiYA==",
-      "dev": true,
-      "requires": {
-        "babel-code-frame": "7.0.0-beta.0",
-        "babel-traverse": "7.0.0-beta.0",
-        "babel-types": "7.0.0-beta.0",
-        "babylon": "7.0.0-beta.22"
       },
       "dependencies": {
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-          "version": "3.2.0",
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-          "dev": true,
-          "requires": {
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-            "esutils": "2.0.2",
-            "js-tokens": "3.0.2"
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diff --git a/package.json b/package.json
index 6905f41..1a0c64c 100644
--- a/package.json
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-    "eslint": "^4.6.1",
+    "babel-eslint": "^8.0.2",
+    "decimal.js": "^7.3.0",
+    "eslint": "^4.11.0",
     "eslint-plugin-babel": "^4.1.1",
     "lodash": "^4.17.4",
     "npm-prepublish": "^1.2.3",
-    "run-with-testrpc": "^0.2.1",
-    "solidity-coverage": "^0.2.3",
-    "truffle": "^3.4.9"
+    "run-with-testrpc": "^0.3.0",
+    "solidity-coverage": "^0.3.5",
+    "truffle": "^3.4.11"
   },
   "repository": {
     "type": "git",