Add pre publish command back

Author: mintuz

package.json

@@ -23,6 +23,7 @@
   },
   "license": "MIT",
   "scripts": {
+    "prepublish": "npm run build",
     "prettier": "prettier --single-quote --tab-width=4 --print-width=80 \"./src/**/*.js\" \"./test/**/*js\" --write",
     "babel": "babel src --out-dir dist --ignore '**/*.test.js'",
     "test": "jest --coverage --no-cache",