Update bootstrap requirement from ~> 5.0.0.beta3 to ~> 5.1.0
Update bootstrap requirement from ~> 5.0.0.beta3 to ~> 5.1.0

Updates the requirements on [bootstrap](https://github.com/twbs/bootstrap-rubygem) to permit the latest version.
- [Release notes](https://github.com/twbs/bootstrap-rubygem/releases)
- [Changelog](https://github.com/twbs/bootstrap-rubygem/blob/master/CHANGELOG.md)
- [Commits](https://github.com/twbs/bootstrap-rubygem/compare/v5.0.0.beta3...v5.1.0)

---
updated-dependencies:
- dependency-name: bootstrap
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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