chore(deps): update dependency coveralls to v3.0.8

Author: renovate-bot

package.json

@@ -51,7 +51,7 @@
     "@types/node": "9.4.6",
     "chai": "4.1.2",
     "chai-http": "3.0.0",
-    "coveralls": "3.0.0",
+    "coveralls": "3.0.8",
     "cucumber": "3.2.1",
     "cucumber-html-reporter": "4.0.1",
     "express": "4.16.2",