use rimraf instead of rm -rf

Author: tiagoschenkel

package.json

@@ -9,7 +9,7 @@
     "mocha": "mocha test/**/*.test.ts --require ts-node/register",
     "autoformat": "prettier --config .prettierrc --write {src,test}/**/*.ts",
     "tslint-check": "tslint-config-prettier-check ./tslint.json",
-    "clean-up": "rm -rf .nyc_output && rm -rf coverage && rm -rf lib",
+    "clean-up": "rimraf .nyc_output && rimraf coverage && rimraf lib",
     "prepare": "npm run clean-up && tsc -d",
     "prepublishOnly": "publish-please guard",
     "publish-please": "npm run autoformat && npm run clean-up && npm run test && publish-please"