Rename master to main

Author: kipcole9

.github/workflows/elixir.yml

@@ -7,9 +7,9 @@ name: Elixir CI
 
 on:
   push:
-    branches: [ "master" ]
+    branches: [ "main" ]
   pull_request:
-    branches: [ "master" ]
+    branches: [ "main" ]
 
 permissions:
   contents: read