fix: upgrade coveralls from 3.0.11 to 3.1.0 (#180)

Snyk has created this PR to upgrade coveralls from 3.0.11 to 3.1.0.

See this package in NPM:
https://www.npmjs.com/package/coveralls

See this project in Snyk:
https://app.snyk.io/org/nodeshift-starters/project/ab8fe181-24c3-460d-bb99-28f47bd0dfd5?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -51,7 +51,7 @@
   },
   "homepage": "https://github.com/nodeshift-starters/nodejs-rest-http-crud#readme",
   "devDependencies": {
-    "coveralls": "^3.0.11",
+    "coveralls": "^3.1.0",
     "js-yaml": "^3.13.1",
     "nodeshift": "~6.2.0",
     "nyc": "~14.1.1",