chore(package): update coveralls to version 3.0.3

Closes #7

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
   },
   "devDependencies": {
     "chai": "^4.0.1",
-    "coveralls": "^2.11.12",
+    "coveralls": "^3.0.3",
     "iced-coffee-coverage": "^1.0.3",
     "iced-coffee-script": "^108.0.11",
     "istanbul": "^0.4.5",