[pkg] Update mocha to version 8.0.1

Author: lpinca

package.json

@@ -46,7 +46,7 @@
   "devDependencies": {
     "assume": "^2.2.0",
     "browserify": "^16.5.0",
-    "mocha": "^7.2.0",
+    "mocha": "^8.0.1",
     "nyc": "^15.1.0",
     "pre-commit": "^1.2.0",
     "sauce-browsers": "^2.0.0",