chore(package): update coveralls to version 3.0.12

Closes #18

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
   },
   "devDependencies": {
     "chai": "^3.5.0",
-    "coveralls": "^2.11.11",
+    "coveralls": "^3.0.12",
     "express": "^4.14.0",
     "iced-coffee-coverage": "^1.0.2",
     "iced-coffee-script": "^108.0.11",