use version as tag for podspec

Author: buschco

react-native-blob-util.podspec

@@ -10,7 +10,7 @@ Pod::Spec.new do |s|
   s.requires_arc = true
   s.license      = 'MIT'
   s.homepage     = 'n/a'
-  s.source       = { :git => "https://github.com/RonRadtke/react-native-blob-util" }
+  s.source       = { :git => "https://github.com/RonRadtke/react-native-blob-util", :tag => "v#{s.version.to_s}" }
   s.author       = 'RonRadtke'
   s.source_files = 'ios/**/*.{h,m,mm,swift}'
   s.platforms       = { :ios => "11.0" }