Updates references to main branch due to renaming it from master.

.github/workflows/codeql-analysis.yml

@@ -13,10 +13,10 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [ master ]
+      branches: [ main ]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master ]
+      branches: [ main ]
   schedule:
     - cron: '40 0 * * 3'
 

README.md

@@ -230,10 +230,22 @@ recommended in enviroments like Kubernetes. They are reachable under `/live` and
 6. Push to the branch (`git push origin my-new-feature`)
 7. Create new pull request
 
+### Renamed branch to `main`
+
+The name of default branch recently changed from `master` to `main`. If you have a local working
+copy of this repository you can rename it using the following commands:
+
+```shell
+git branch -m master main
+git fetch origin
+git branch -u origin/main main
+git remote set-head origin -a
+```
+
 ## License
 
 The KNX Exporter is released under the Apache 2.0 license. See
-[LICENSE](https://github.com/chr-fritz/knx-exporter/blob/master/LICENSE)
+[LICENSE](https://github.com/chr-fritz/knx-exporter/blob/main/LICENSE)
 
 ## Maintainer