(docs): Update README

Author: daformat

README.md

@@ -1,6 +1,7 @@
 # React split-flap display
 
 ![NPM Version](https://img.shields.io/npm/v/%40daformat%2Freact-split-flap-display)
+![gzipped](https://img.shields.io/bundlephobia/minzip/@daformat/react-split-flap-display?color=%238ab4f8&label=gzip)
 ![NPM Downloads](https://img.shields.io/npm/dm/%40daformat%2Freact-split-flap-display)  
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