Changelog for latest releases

[ShockwaveNN]

Hi, seems several latest releases do not have a changelog (not in changelog file nor in GitHub releases page)
Could this be fixed? I've using dependabot to update my requirements and empty changelog is not very good on upgrade process

[glebm]

There were no changes to the gem-specific code since the last entry.
The changelog for Bootstrap itself is available at https://github.com/twbs/bootstrap/releases and won't be duplicated in this repo.

See https://github.com/twbs/bootstrap-rubygem/blob/master/CHANGELOG.md

[ShockwaveNN]

Maybe it's a good idea to add changelog entries like these?

## 4.5.2
No changes to gem-specific code.
Bootstrap changes are [here](https://github.com/twbs/bootstrap/releases/tag/v4.5.2)