add waffle.io badge
Merge pull request #1 from waffleio/master

waffle.io Badge
Merge branch 'master' of https://github.com/killuavx/game_center
Merge branch 'master' into develop

Conflicts:
	README.md
fix compare datatime between package.updated_datetiem and packageversion.updated_datetime use timedalt, is should less then 1 second between packageversion.updated_datetime and package.updated_datetime
fix compare datatime between package.updated_datetiem and packageversion.updated_datetime use timedalt, is should less then 1 second between packageversion.updated_datetime and package.updated_datetime