chore: fix typo in "GitHub" (#132)

Author: alexandear

README.md

@@ -3,7 +3,7 @@
 <div align="center">
 
 ![xc](https://user-images.githubusercontent.com/19927761/156772881-10065864-ff4d-4225-ab2b-5adbbe628845.png)
-[Docs](https://xcfile.dev/) | [Getting Started](https://xcfile.dev/getting-started/) | [Github](https://github.com/joerdav/xc)
+[Docs](https://xcfile.dev/) | [Getting Started](https://xcfile.dev/getting-started/) | [GitHub](https://github.com/joerdav/xc)
 
 [![xc compatible](https://xcfile.dev/badge.svg)](https://xcfile.dev)
 [![test](https://github.com/joerdav/xc/actions/workflows/test.yaml/badge.svg)](https://github.com/joerdav/xc/actions/workflows/test.yaml)