Run CI on main branch pull requests (#271)

Author: Kludex

.github/workflows/main.yml

@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: ["master"]
+    branches: ["main"]
   pull_request:
-    branches: ["master"]
+    branches: ["main"]
 
 permissions: {}