Update test-build-resources-with-pandoc.yml

Author: ota-meshi

.github/workflows/test-build-resources-with-pandoc.yml

@@ -6,7 +6,7 @@ on:
       - "*" # matches every branch that doesn't contain a '/'
       - "*/*" # matches every branch containing a single '/'
       - "**" # matches every branch
-      - "!master" # excludes master
+      - "!main" # excludes master
 
 jobs:
   build-resources-with-pandoc: