Merge pull request #378 from XhmikosR/develop

Fix the last Bootlint error.
[#382] Bootlint v0.4.0
Merge pull request #383 from XhmikosR/develop

Update dependencies.
Merge pull request #384 from MaxCDN/bootlint_v0.4.0

[#382] Bootlint v0.4.0
Fix yet another validation error.

It was caused by a missing quote in _tweets.yml.