docs: include more status badges

Author: tgrk

README.md

@@ -1,8 +1,12 @@
 # ExOura
 
 [![Hex.pm](https://img.shields.io/hexpm/v/ex_oura)](https://hex.pm/packages/ex_oura) 
+[![Hex Docs](https://img.shields.io/badge/hex-docs-lightgreen.svg)](https://hexdocs.pm/ex_oura/)
 [![Build Status](https://github.com/tgrk/ex_oura/actions/workflows/elixir.yaml/badge.svg)](https://github.com/tgrk/ex_oura/actions)
 [![Coverage Status](https://coveralls.io/repos/github/tgrk/ex_oura/badge.svg)](https://coveralls.io/github/tgrk/ex_oura)
+[![Last Updated](https://img.shields.io/github/last-commit/tgrk/ex_oura.svg)](https://github.com/tgrk/ex_oura/commits/master)
+[![License](https://img.shields.io/hexpm/l/ex_oura.svg)](https://github.com/sticksnleaves/ex_oura/blob/master/LICENSE.md)
+
 
 **An Elixir client for the Oura API, leveraging the OpenAPI v1.23 specification.**