message: Use a more restrictive `sed` pattern
diff: @@ -277,7 +277,7 @@ def main():
  # Migrate the changelog notes from v2 version numbers to v1 version numbers
  print('Migrating changelog notes from v2 to v1')
  - subprocess.run(['sed', '-i', 's/## 2\./## 1\./g', 'CHANGELOG.md'])
  + subprocess.run(['sed', '-i', 's/^## 2\./## 1./g', 'CHANGELOG.md'])
  # Amend the commit generated by `npm version` to update the CHANGELOG
  run_git('add', 'CHANGELOG.md')
  