Update bump requirement from ~> 0.6.1 to ~> 0.8.0

[dependabot-preview[bot]]

Updates the requirements on bump to permit the latest version.

Commits

- [`1658f9f`](https://github.com/gregorym/bump/commit/1658f9f4fc200e92d8a39c03a7eafdac012d613a) v0.8.0 - [`ba4c33d`](https://github.com/gregorym/bump/commit/ba4c33dba1ade225e70f5739b7d15326a7f5b175) Merge pull request [#88](https://github-redirect.dependabot.com/gregorym/bump/issues/88) from sharma1nitish/feature/add_tag_prefix_option - [`108bbe3`](https://github.com/gregorym/bump/commit/108bbe38930e42a0aaccbc95a173aa4cc1a9d7c3) Update tag prefix option parsing - [`c570571`](https://github.com/gregorym/bump/commit/c5705717332a28d8dcd5857ee247426a346c58de) Update README.md - [`9426007`](https://github.com/gregorym/bump/commit/942600706e864ea66caaaa2974da5588e830d494) Merge branch 'master' into feature/add_tag_prefix_option - [`287dcd1`](https://github.com/gregorym/bump/commit/287dcd17e627ac4abeb8c4ba9bfa6c6b9f883913) Use "" as empty tag prefix instead of FALSE - [`7f308b2`](https://github.com/gregorym/bump/commit/7f308b23466cdbeab4421fd6749a0f019065e0d6) 1. Modify examples in README - [`b324a64`](https://github.com/gregorym/bump/commit/b324a64b7efcc98e328a563e333e09c79381610c) Remove puts debugging statements - [`b24a4e4`](https://github.com/gregorym/bump/commit/b24a4e4abf877bd9022ecf466e30b8eac2f75995) Add sanitized options - [`eb4dc00`](https://github.com/gregorym/bump/commit/eb4dc003ab196971f3fe50cf6d1928b4c53d45b9) Merge pull request [#87](https://github-redirect.dependabot.com/gregorym/bump/issues/87) from ysv/feature/next-version - Additional commits viewable in [compare view](https://github.com/gregorym/bump/compare/v0.6.1...v0.8.0)

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---

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[dependabot-preview[bot]]

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[watermarkchurch-bot]

	1 Warning
:warning:	No issue referenced - please create an issue describing a single unit of work and reference it using “closes #[the issue number]”

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[coveralls]

Coverage remained the same at 94.269% when pulling dbd1326f84de10e94d71bd7bce09270d41884e80 on dependabot/bundler/bump-tw-0.8.0 into 2ad638053378418c59de43feeb500e74b8be1bc8 on master.