[#62]Make first_known_log_id default impl

[GrapeBaBa]

Signed-off-by: grapebaba 281165273@qq.com

Checklist

• Updated CHANGELOG.md describing pertinent changes.
• Updated README.md with pertinent info (may not always apply).
• Updated guide with pertinent info (may not always apply).
• Squash down commits to one or two logical commits which clearly describe the work you've done. If you don't, then Dodd will :).

[GrapeBaBa]

@drmingdrmer how to update change log?

[drmingdrmer]

@drmingdrmer how to update change log?

@GrapeBaBa
There is a script ./scripts/build_change_log.py <new_tag> <commit_hash> to do this job.

Change log is only built when creating a new tag for release.
Personally, I prefer tracking changes with git commit-message. :DDD

[drmingdrmer]

Nice shot!