rename master to main

rename master to main

Author: richm

.github/workflows/codeql.yml

@@ -3,9 +3,9 @@ name: "CodeQL"
 
 on:  # yamllint disable-line rule:truthy
   push:
-    branches: ["master"]
+    branches: ["main"]
   pull_request:
-    branches: ["master"]
+    branches: ["main"]
   schedule:
     - cron: "48 9 * * 6"