chore(package): update coveralls to version 2.13.0

Closes #56

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "babel-plugin-transform-es2015-modules-umd": "6.18.0",
     "babel-preset-es2015": "6.18.0",
     "chai": "3.5.0",
-    "coveralls": "2.11.15",
+    "coveralls": "2.13.0",
     "documentation": "4.0.0-beta16",
     "eslint": "3.12.2",
     "imports-loader": "0.7.0",