twbs/bootstrap — pull request #13642 by appleboy (2014-05-21 10:40:20+00:00)
Title: Use `<!doctype html>` instead of `<!DOCTYPE html>`

Ref: https://github.com/h5bp/html5-boilerplate/commit/e67e9cc7c1b5a395521a6ee43031becc321e605a

cc @cvrebert @XhmikosR