Added clean script

Author: Jaid

package-lock.json

@@ -21,11 +21,13 @@
     "eslint-config-jaid": "1.10.0",
     "jest": "^24.0.0",
     "opn-cli": "^4.0.0",
+    "rimraf": "^2.6.3",
     "webpack": "^4.29.0",
     "webpack-cli": "^3.2.1",
     "webpack-config-jaid": "1.19.0"
   },
   "scripts": {
+    "clean": "rimraf dist dist-jsdoc",
     "build:prod": "cross-env NODE_ENV=production webpack",
     "build:dev": "webpack",
     "test": "npm run build:prod && jest",