Include yarn.lock and update CI

.npmignore

@@ -4,3 +4,4 @@ node_modules
 scripts
 .eslintignore
 .travis.yml
+yarn.lock

.travis.yml

@@ -4,18 +4,31 @@ sudo: false
 language: node_js
 cache:
   directories:
-  - node_modules
+    - node_modules
+    - ~/.yarn-cache
 node_js:
 - '7'
 - '6'
 - '4'
 - '0.12'
 - '0.10'
+env:
+  global:
+    - PKG_CMD="npm"
+before_install:
+  - nvm use $TRAVIS_NODE_VERSION
+  - npm set loglevel error
+  - npm set progress false
+install:
+  - $PKG_CMD install
 script:
-  - 'if [ -n "${LINT-}" ]; then npm run lint ; fi'
-  - 'if [ -z "${LINT-}" ]; then npm run ci ; fi'
+  - 'if [ -n "${LINT-}" ]; then $PKG_CMD run lint ; fi'
+  - 'if [ -z "${LINT-}" ]; then $PKG_CMD run ci ; fi'
 matrix:
   fast_finish: true
   include:
+    - node_js: "node"
+      env: PKG_CMD="yarn"
+      before_install: npm i -g yarn
     - node_js: "node"
       env: LINT=true

package.json

@@ -54,7 +54,7 @@
     "babel-plugin-transform-flow-strip-types": "^6.8.0",
     "babel-preset-es2015": "^6.14.0",
     "babel-register": "^6.14.0",
-    "compat-table": "github:kangax/compat-table#e732718eab42c6c83a364450f456474638d31f94",
+    "compat-table": "kangax/compat-table#e732718eab42c6c83a364450f456474638d31f94",
     "eslint": "^3.3.1",
     "eslint-config-babel": "^3.0.0",
     "eslint-plugin-babel": "^4.0.0",