chore(package): update should to version 13.2.0

Closes #3

package.json

@@ -11,6 +11,6 @@
       "log": ">= 1.2.0"
     , "mkdirp": ">= 0.0.1"
   },
-  "devDependencies": { "should": "~11.2.1" },
+  "devDependencies": { "should": "~13.2.0" },
   "engines": { "node": "*" }
 }