[pkg] Update mocha to version 7.2.0 (#228)

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
   "devDependencies": {
     "assume": "~2.2.0",
     "browserify": "~16.5.0",
-    "mocha": "~7.1.0",
+    "mocha": "~7.2.0",
     "nyc": "~15.0.0",
     "pre-commit": "~1.2.0",
     "sauce-browsers": "~2.0.0",