Update dependency coveralls to v3.0.12

package.json

@@ -41,7 +41,7 @@
     "@types/jest": "25.2.1",
     "@typescript-eslint/eslint-plugin": "2.29.0",
     "@typescript-eslint/parser": "2.29.0",
-    "coveralls": "3.0.11",
+    "coveralls": "3.0.12",
     "eslint": "6.8.0",
     "eslint-plugin-import": "2.20.2",
     "eslint-plugin-jest": "23.8.2",