Update dependency coveralls to v3.0.12

Author: renovate-bot

package.json

@@ -38,7 +38,7 @@
     "@babel/preset-env": "7.9.5",
     "@babel/register": "7.9.0",
     "ava": "3.7.1",
-    "coveralls": "3.0.11",
+    "coveralls": "3.0.12",
     "esdoc": "1.1.0",
     "nyc": "15.0.1"
   },