change pod version

src/react-native-fetch-blob.podspec

 Pod::Spec.new do |s|
   s.name             = "react-native-fetch-blob"
-  s.version          = "0.9.3"
+  s.version          = "0.9.4-beta.3"
   s.summary          = "A project committed to make file acess and data transfer easier, effiecient for React Native developers."
   s.requires_arc = true
   s.license      = 'MIT'
   s.homepage     = 'n/a'
   s.authors      = { "wkh237" => "xeiyan@gmail.com" }
-  s.source       = { :git => "https://github.com/wkh237/react-native-fetch-blob" }
+  s.source       = { :git => "https://github.com/wkh237/react-native-fetch-blob", :tag => 'v0.9.4-beta.3'}
   s.source_files = 'ios/**/*.{h,m}'
   s.platform     = :ios, "7.0"
   s.dependency 'React/Core'