[Readme] Add build status badge
[Readme] Add build status badge
k0nserv/trunk.cocoapods.org,k0nserv/trunk.cocoapods.org,Shawn-WangDapeng/trunk.cocoapods.org,CocoaPods/trunk.cocoapods.org,k0nserv/trunk.cocoapods.org,billinghamj/trunk.cocoapods.org,Shawn-WangDapeng/trunk.cocoapods.org,billinghamj/trunk.cocoapods.org,CocoaPods/trunk.cocoapods.org