chore(package): update coveralls to version 3.0.6

Closes #22

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
   },
   "devDependencies": {
     "ava": "^0.16.0",
-    "coveralls": "^2.11.15",
+    "coveralls": "^3.0.6",
     "eslint-config-punchcard": "^1.1.6",
     "ghooks": "^1.3.2",
     "nyc": "^9.0.1",