chore: add clean script for dependencies (#28)

Author: smithad15

package.json

@@ -5,6 +5,9 @@
   ],
   "scripts": {
     "build": "lerna run build",
+    "clean": "npm-run-all -p clean:*",
+    "clean:workspace-deps": "rimraf node_modules",
+    "clean:package-deps": "rimraf packages/*/node_modules",
     "lint": "npm-run-all -p lint:*",
     "lint:packages": "lerna run lint",
     "lint:prettier": "prettier -l \"**/*.*(ts|js|css|scss|json|md)\"",
@@ -27,6 +30,7 @@
     "lerna": "2.11.0",
     "lint-staged": "7.2.0",
     "npm-run-all": "4.1.3",
-    "prettier": "1.13.7"
+    "prettier": "1.13.7",
+    "rimraf": "2.6.2"
   }
 }