Update README.md

Author: aevyrie

README.md

@@ -4,7 +4,7 @@
 
 [![crates.io](https://img.shields.io/crates/v/bevy_mod_picking)](https://crates.io/crates/bevy_mod_picking)
 [![docs.rs](https://docs.rs/bevy_mod_picking/badge.svg)](https://docs.rs/bevy_mod_picking)
-[![CI](https://github.com/aevyrie/bevy_mod_picking/workflows/CI/badge.svg?branch=master)](https://github.com/aevyrie/bevy_mod_picking/actions?query=workflow%3A%22CI%22+branch%3Amaster)
+[![CI](https://github.com/aevyrie/bevy_mod_picking/workflows/CI/badge.svg?branch=main)](https://github.com/aevyrie/bevy_mod_picking/actions?query=workflow%3A%22CI%22+branch%3Amain)
 [![Bevy tracking](https://img.shields.io/badge/Bevy%20tracking-main-lightblue)](https://github.com/bevyengine/bevy/blob/main/docs/plugins_guidelines.md#main-branch-tracking)
 
 ![demo](https://user-images.githubusercontent.com/2632925/235874600-de0c7720-6775-42e1-8650-41ee8ac68d1b.gif)