chore(package): update coveralls to version 2.13.1

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "babel-plugin-transform-es2015-modules-umd": "^6.23.0",
     "babel-preset-es2015": "^6.18.0",
     "babel-preset-stage-0": "^6.16.0",
-    "coveralls": "^2.11.15",
+    "coveralls": "^2.13.1",
     "jest": "^19.0.2",
     "jest-each": "0.2.0"
   },