chore(deps): update dependency bootstrap-sass to version 3.4.0 🌟

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
bootstrap-sass	devDependencies	minor	3.3.5 -> 3.4.0	source

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Release Notes

twbs/bootstrap-sass

v3.4.0

Compare Source

• Bootstrap rubygem now depends on SassC instead of Sass.
• Compass no longer supported.

v3.3.7

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• Allows jQuery 3.x in bower.json. #​1048
• Adds the style and sass fields to package.json. #​1045
• Adds Eyeglass support. #​1007

v3.3.6

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• Bumps Sass dependency to 3.3.4+ to avoid compatibility issues with @​at-root.
• Bumps node-sass dependency to ~3.4.2 for Node.js v5 compatibility. #​986
• Fixes breadcrumb content issues on libsass. #​919
• Fixes a Rails 5 compatibility issue. #​965

Framework version: Bootstrap v3.3.6

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