docs: mention npm run commitlint:merge-base in the README

[skip ci]
GenSpectrum · Apr 25, 2024 · 610952c · 610952c
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commit 610952c
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diff --git a/README.md b/README.md
@@ -197,3 +197,9 @@ The last commit message can be checked with
 ```shell
 npm run commitlint:last-commit
 ``` 
+
+To check commit messages of a branch to the commit where it branches off from `main`, run
+
+```shell
+npm run commitlint:merge-base
+```