Fix typo in .podspec tag name
Fix typo in .podspec tag name

idoru/PivotalCoreKit,gudatcomputers/PivotalCoreKit,briancroom/PivotalCoreKit,pivotaltracker/PivotalCoreKit,joemasilotti/PivotalCoreKit,jfuchs/PivotalCoreKit,gudatcomputers/PivotalCoreKit,idoru/PivotalCoreKit,mjstallard/PivotalCoreKit,jfuchs/PivotalCoreKit,pivotal/PivotalCoreKit,joemasilotti/PivotalCoreKit