Update bootstrap requirement from ~3.3.2 to ~3.4.0

[dependabot-preview]

Updates the requirements on bootstrap to permit the latest version.

Release notes

Sourced from bootstrap's releases.

v3.4.0

• New: Added a .row-no-gutters class.
• New: Added docs searching via Algolia.
• Fixed: Resolved an XSS issue in Alert, Carousel, Collapse, Dropdown, Modal, and Tab components. See https://snyk.io/vuln/npm:bootstrap:20160627 for details.
• Fixed: Added padding to .navbar-fixed-* on modal open
• Fixed: Removed the double border on <abbr> elements.
• Removed Gist creation in web-based Customizer since anonymous gists were disabled long ago by GitHub.
• Removed drag and drop support from Customizer since it didn't work anymore.
• Added a dropdown to the docs nav for newer and previous versions.
• Update the docs to use a new baseurl, /docs/3.4/, to version the v3.x documentation like we do with v4.
• Reorganized the v3 docs CSS to use Less.
• Switched to BrowserStack for tests.
• Updated links to always use https and fix broken URLs.
• Replaced ZeroClipboard with clipboard.js

Commits

• See full diff in compare view

Maintainer changes

This version was pushed to npm by xhmikosr, a new releaser for bootstrap since your current version.

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[coveralls]

Coverage remained the same at 100.0% when pulling b281e4b on dependabot/npm_and_yarn/bootstrap-approx-3.4.0 into b919808 on master.