Update dependency coveralls to v3.1.0

Author: renovate-bot

package.json

@@ -26,7 +26,7 @@
   "devDependencies": {
     "chai": "4.2.0",
     "chai-as-promised": "7.1.1",
-    "coveralls": "3.0.11",
+    "coveralls": "3.1.0",
     "dependency-check": "3.4.1",
     "eslint": "5.16.0",
     "eslint-config-semistandard": "13.0.0",