Update themis.podspec
Update themis.podspec

Change summary and description
storojs72/themis,mnaza/themis,cossacklabs/themis,cossacklabs/themis,Lagovas/themis,cossacklabs/themis,mnaza/themis,cossacklabs/themis,cossacklabs/themis,mnaza/themis,storojs72/themis,Lagovas/themis,cossacklabs/themis,Lagovas/themis,mnaza/themis,storojs72/themis,storojs72/themis,Lagovas/themis,cossacklabs/themis,storojs72/themis,mnaza/themis,Lagovas/themis,mnaza/themis,Lagovas/themis,cossacklabs/themis,cossacklabs/themis,storojs72/themis,mnaza/themis,storojs72/themis,Lagovas/themis,mnaza/themis,Lagovas/themis,storojs72/themis,storojs72/themis,cossacklabs/themis,storojs72/themis,cossacklabs/themis,mnaza/themis,cossacklabs/themis,cossacklabs/themis,Lagovas/themis