Change default branch to main

.github/workflows/publish.yml

@@ -2,7 +2,7 @@ name: Publish gem
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   publish:

bin/rb_lint.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 echo "Checking changed files"
-files=$(git diff --name-only origin/master -- | xargs ls -d 2>/dev/null | egrep "\.(rb|spec|rake|rhtml|rjs|rxml|erb)$")
+files=$(git diff --name-only origin/main -- | xargs ls -d 2>/dev/null | egrep "\.(rb|spec|rake|rhtml|rjs|rxml|erb)$")
 echo "Changed files:"
 echo "***"
 echo "$files"