Would be useful if cherry-picker messages were more prominent

As people have learned I am not always the most observant person in the world. My initial attempts to use cherry-picker were complicated by the fact that I paid attention to messages from git cherry-pick, not cherry-picker's own messages. It would be nice if the message sources were better distinguished, either by dimming the messages from git cherry-pick or by coloring the messages from cherry-picker.

If you think something like this would be useful, I could work on a PR. It seems that any desired changes would be straightforward, as current console output already uses click.echo().

まず、click.echo() を使用している cherry-picker のコンソール出力を見つけ、issue に記載されている git cherry-pick の出力とそのメッセージを比較します。cherry-picker のメッセージが git cherry-pick のメッセージと見た目で区別でき、関連する出力パスがカバレッジされていれば完了です。