docs: update badges

Author: amaanq

README.md

@@ -1,6 +1,7 @@
 # tree-sitter-python
 
-[![build](https://github.com/tree-sitter/tree-sitter-python/actions/workflows/ci.yml/badge.svg)](https://github.com/tree-sitter/tree-sitter-python/actions/workflows/ci.yml)
+[![CI](https://github.com/tree-sitter/tree-sitter-python/actions/workflows/ci.yml/badge.svg)](https://github.com/tree-sitter/tree-sitter-python/actions/workflows/ci.yml)
+[![Discord](https://img.shields.io/discord/1063097320771698699?logo=discord)](https://discord.gg/w7nTvsVJhm)
 
 Python grammar for [tree-sitter][].