Bump bootstrap from 4.5.3 to 5.0.1

[dependabot-preview[bot]]

Bumps bootstrap from 4.5.3 to 5.0.1.

Commits

• 73f9c09 Update to v5.0.1
• 73ff038 Update to v5.0.0
• 5be8a01 fix README typo
• 7d23f76 Bump popper_js version
• a949bd8 Update to v5.0.0-beta3
• 07bc477 Updater: Mark util/scrollbar.js as inlined
• fdef7a0 Updater: log file on network error
• 8b5b579 Bump minimum Popper version to v2.8.6
• e9fb4c7 travis: Add Rails 6.1
• c43a4cb Update test rails app view
• Additional commits viewable in compare view

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