+Export these environment variables:
+
+```
+export ICINGA_GITHUB_AUTH_USERNAME='user'
+export ICINGA_GITHUB_AUTH_TOKEN='token'
+export ICINGA_GITHUB_PROJECT='icinga/icinga2'
+```
+
+Run the script which updates the [CHANGELOG.md](CHANGELOG.md) file.
+
+```
+./changelog.py
+git diff
+```
+