Fix wrong PR description

Author: Jan Koscielniak

release_bot/github.py

@@ -324,10 +324,9 @@ def make_release_pr(self, new_pr):
             changelog = repo.get_log_since_last_release(new_pr['previous_version'])
             repo.checkout_new_branch(branch)
             changed = look_for_version_files(repo.repo_path, new_pr['version'])
-            changelog_changed = insert_in_changelog(f'{repo.repo_path}/CHANGELOG.md',
-                                                    new_pr['version'], changelog)
-            if changelog_changed:
-                changed.append(f'{repo.repo_path}/CHANGELOG.md')
+            if insert_in_changelog(f'{repo.repo_path}/CHANGELOG.md',
+                                   new_pr['version'], changelog):
+                repo.add(['CHANGELOG.md'])
             if changed:
                 repo.add(changed)
             repo.commit(f'{version} release', allow_empty=True)