Merge branch 'warn-for-deprecated-specs-on-outdated' of https://github.com/segiddins/CocoaPods into segiddins-warn-for-deprecated-specs-on-outdated

* 'warn-for-deprecated-specs-on-outdated' of https://github.com/segiddins/CocoaPods:
  Update Changelog
  Refactored Command::Outdated to make it stub-able
  Warn for deprecated specs on outdated

Conflicts:
	CHANGELOG.md