Another master -> main rename

Author: andrewkroh

.github/workflows/build.yml

@@ -47,7 +47,7 @@ jobs:
         run: go test ./...
 
       - name: publish gh-pages
-        if: github.ref == 'refs/heads/master' && github.event_name == 'push'
+        if: github.ref == 'refs/heads/main' && github.event_name == 'push'
         run: |
           git config --local user.email "$(git log --format='%ae' HEAD^!)"
           git config --local user.name "$(git log --format='%an' HEAD^!)"