add badges to readme

Author: the-mikedavis

README.md

@@ -1,5 +1,11 @@
 # Mint.WebSocket
 
+![CI](https://github.com/NFIBrokerage/mint_web_socket/workflows/CI/badge.svg)
+[![Coverage Status](https://coveralls.io/repos/github/NFIBrokerage/mint_web_socket/badge.svg)](https://coveralls.io/github/NFIBrokerage/mint_web_socket)
+[![hex.pm version](https://img.shields.io/hexpm/v/mint_web_socket.svg)](https://hex.pm/packages/mint_web_socket)
+[![hex.pm license](https://img.shields.io/hexpm/l/mint_web_socket.svg)](https://github.com/NFIBrokerage/mint_web_socket/blob/main/LICENSE)
+[![Last Updated](https://img.shields.io/github/last-commit/NFIBrokerage/mint_web_socket.svg)](https://github.com/NFIBrokerage/mint_web_socket/commits/main)
+
 (Unofficial) HTTP/1 and HTTP/2 WebSocket support for Mint 🌱
 
 ## What is Mint?