Remove development branch warning

Author: alcuadrado

Diff for: packages/buidler-core/README.md

@@ -8,8 +8,6 @@ Developed by [Nomic Labs](https://nomiclabs.io/) and funded by an Ethereum Found
 
 Join our [Buidler Telegram group](http://t.me/BuidlerSupport) to stay up to date on new releases, plugins and tutorials.
 
-🚧 **This the development branch of Buidler. For the latest version of the code, look at [`master`](https://github.com/nomiclabs/buidler/tree/master)** 🚧
-
 ## Installation
 
 ### Local installation (recommended)