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Add CHANGELOG.md modification check and warning comment #260

Job	Run time
Per-language bundles (go, ubuntu-latest, nightly-latest, autobuild)	1m 11s
Per-language bundles (ruby, ubuntu-latest, nightly-latest)	46s
Per-language bundles (cpp, ubuntu-latest, nightly-latest, manual, gcc -o main main.c)	45s
Per-language bundles (python, ubuntu-latest, nightly-latest)	53s
Per-language bundles (csharp, ubuntu-latest, nightly-latest, none)	1m 0s
Per-language bundles (javascript, ubuntu-latest, nightly-latest)	49s
Per-language bundles (actions, ubuntu-latest, nightly-latest, actions javascript)	1m 17s
Per-language bundles (java, ubuntu-latest, nightly-latest, none)	1m 1s
Per-language bundles (rust, ubuntu-latest, nightly-latest)	1m 18s
Per-language bundles (swift, macos-latest-xlarge, nightly-latest, autobuild)	1m 20s
	10m 20s