feat($defer): add defer attribute to scripts

Author: faceyspacey

README.md

@@ -10,6 +10,7 @@
 # Webpack Flush Chunks
 
 
+
 <p align="center">
   <a href="https://www.npmjs.com/package/webpack-flush-chunks">
     <img src="https://img.shields.io/npm/v/webpack-flush-chunks.svg" alt="Version" />