added tag specification to as pod link requires

Author: oleganza

Diff for: CoreBitcoin.podspec

@@ -3,18 +3,14 @@ Pod::Spec.new do |s|
   s.version      = "0.5.0"
   s.summary      = "CoreBitcoin is an implementation of Bitcoin protocol in Objective-C."
   s.description  = <<-DESC
-                   CoreBitcoin is an implementation of Bitcoin protocol in Objective-C.
-                   When it is completed, it will let you create an application that acts
-                   as a full Bitcoin node. You can encode/decode addresses, apply various
-                   hash functions, sign and verify messages and parse some data structures.
-                   Transaction support is still incomplete.
+                   CoreBitcoin is a complete toolkit to work with Bitcoin data structures.
                    DESC
   s.homepage     = "https://github.com/oleganza/CoreBitcoin"
   s.license      = 'WTFPL'
   s.author       = { "Oleg Andreev" => "[email protected]" }
   s.ios.deployment_target = '7.0'
   s.osx.deployment_target = '10.9'
-  s.source       = { :git => "https://github.com/oleganza/CoreBitcoin.git" }
+  s.source       = { :git => "https://github.com/oleganza/CoreBitcoin.git", :tag => s.version.to_s }
   s.source_files = 'CoreBitcoin'
   s.exclude_files = 'CoreBitcoin/**/*+Tests.{h,m}'
   s.requires_arc = true