chore(package): update gulp-mocha to version 7.0.2

Closes #73

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
 		"gulp-eslint": "^5.0.0",
 		"gulp-gh-pages": "0.5.4",
 		"gulp-istanbul": "^1.1.3",
-		"gulp-mocha": "^6.0.0",
+		"gulp-mocha": "^7.0.2",
 		"gulp-rename": "^1.4.0",
 		"gulp-shell": "0.6.5",
 		"jsdoc": "3.5.5",