Add watchOS 2 as supported platform to podspec.
Add watchOS 2 as supported platform to podspec.

AnthonyMDev/KeychainAccess,ikesyo/KeychainAccess,sonsongithub/KeychainAccess,wimirwan/KeychainAccess,ikesyo/KeychainAccess,tokorom/KeychainAccess,colemancda/KeychainAccess,wimirwan/KeychainAccess,Kingside/KeychainAccess,kishikawakatsumi/KeychainAccess,kishikawakatsumi/KeychainAccess,tokorom/KeychainAccess,AnthonyMDev/KeychainAccess,mspasov/KeychainAccess,colemancda/KeychainAccess,colemancda/KeychainAccess,mspasov/KeychainAccess,ikesyo/KeychainAccess,Kingside/KeychainAccess,sonsongithub/KeychainAccess,kishikawakatsumi/KeychainAccess,sonsongithub/KeychainAccess