fix(build): update npm clean script to clear the cache

Author: joshuawilson

package.json

@@ -4,12 +4,13 @@
   "scripts": {
     "ng": "ng",
     "start": "ng serve",
-    "clean": "npm run clean:lib && npm run clean:app",
+    "clean": "npm cache clear --force && npm run clean:lib && npm run clean:app",
     "clean:lib": "npm run rimraf -- projects/ngx-feature-flag/node_modules",
     "clean:app": "npm run rimraf -- package-lock.json node_modules dist src/assets/README.md",
     "build": "npm run build:lib && npm run build:app",
     "build:app": "ng build",
     "prebuild:app": "cp README.md src/assets/README.md",
+    "reinstall": "npm run clean && npm install",
     "rimraf": "rimraf",
     "test": "npm run test:lib",
     "test:app": "ng test --watch=false",