Add rm-dist script

package.json

@@ -13,6 +13,7 @@
     "version-patch": "lerna version patch",
     "version": "lerna version",
     "yarn-install": "for d in ./packages/*/ ; do (cd \"$d\" && yarn install); done;",
+    "rm-dist": "for d in ./packages/*/ ; do (cd \"$d\" && rm dist -Rf); done;",
     "lint": "lerna run lint",
     "publish": "lerna publish from-package --yes"
   },