Update dependency coveralls to v3.1.0

Author: renovate-bot

package-lock.json

@@ -23,7 +23,7 @@
     "babel-plugin-istanbul": "5.2.0",
     "babel-preset-env": "1.7.0",
     "babel-preset-stage-3": "6.24.1",
-    "coveralls": "3.0.11",
+    "coveralls": "3.1.0",
     "css-loader": "3.5.2",
     "cypress": "3.8.3",
     "html-webpack-plugin": "3.2.0",