visionmedia/jade — pull request #1487 by sjonnet19 (2014-04-02 13:49:10+00:00)
Title: Use `<!doctype html>` instead of `<!DOCTYPE html>`

Return back to the lowercase doctype in order to be more consistent
with the lowercase of the html tags.

References:

* h5bp/html5-boilerplate#1522
* http://www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html#the-doctype