update webpack badge

Author: waldronmatt

README.md

@@ -1,6 +1,6 @@
 # MixPack
 
-[![Netlify Status](https://api.netlify.com/api/v1/badges/981f8252-c7bd-4215-8b05-60aee8402a2d/deploy-status)](https://app.netlify.com/sites/mixpack/deploys) ![webpack](https://img.shields.io/badge/webpack-5.0.0-green)
+[![Netlify Status](https://api.netlify.com/api/v1/badges/981f8252-c7bd-4215-8b05-60aee8402a2d/deploy-status)](https://app.netlify.com/sites/mixpack/deploys) ![webpack](https://img.shields.io/badge/webpack-5.0.0-rc.6-green)
 
 A mixed TypeScript/JavaScript Webpack boilerplate with Express. [Click here to see it live on Netlify](https://mixpack.netlify.app).