angular/angular.js — pull request #6407 by gogotanaka (2014-02-22 18:00:56+00:00)
Title: fix trivial format

While this may be no big deal, I found some issues format style.

"CHANGELOG.md" contain 2-space indent and tab indent.

"CONTRIBUTING.md" contain wasted spaces.

Truth be told, I want to do more great things for ruby, but because my ability clumsy yet, start with these ...!