Merge pull request #875 from Binaryify/renovate/mocha-8.x

Update dependency mocha to v8

package.json

@@ -48,7 +48,7 @@
     "husky": "4.2.5",
     "intelli-espower-loader": "1.0.1",
     "lint-staged": "10.2.11",
-    "mocha": "6.2.3",
+    "mocha": "8.1.1",
     "power-assert": "1.6.1"
   }
 }