Remove unused gulp-zip package

Author: alexcanessa

package-lock.json

@@ -79,7 +79,6 @@
         "gulp-if": "^2.0.2",
         "gulp-sass": "^3.1.0",
         "gulp-watch": "^4.3.11",
-        "gulp-zip": "^4.0.0",
         "jsdoc": "^3.4.3",
         "minami": "^1.2.3",
         "nyc": "^11.2.1",