podspec updates for Firebase 5

FirebaseStorage.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseStorage'
-  s.version          = '2.2.0'
-  s.summary          = 'Firebase Storage for iOS'
+  s.version          = '3.0.0'
+  s.summary          = 'Firebase Storage for iOS (plus experimental support for macOS and tvOS)'
 
   s.description      = <<-DESC
 Firebase Storage provides robust, secure file uploads and downloads from Firebase SDKs, powered by Google Cloud Storage.
@@ -13,10 +13,10 @@ Firebase Storage provides robust, secure file uploads and downloads from Firebas
 
   s.source           = {
     :git => 'https://github.com/firebase/firebase-ios-sdk.git',
-    :tag => s.version.to_s
+    :tag => 'Storage-' + s.version.to_s
   }
   s.social_media_url = 'https://twitter.com/Firebase'
-  s.ios.deployment_target = '7.0'
+  s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
 
@@ -29,8 +29,8 @@ Firebase Storage provides robust, secure file uploads and downloads from Firebas
   s.ios.framework = 'MobileCoreServices'
   s.osx.framework = 'CoreServices'
 
-  s.dependency 'FirebaseCore', '~> 4.0'
-  s.ios.dependency 'FirebaseAnalytics', '~> 4.0'
+  s.dependency 'FirebaseCore', '~> 5.0'
+  s.ios.dependency 'FirebaseAnalytics', '~> 5.0'
   s.dependency 'GTMSessionFetcher/Core', '~> 1.1'
   s.pod_target_xcconfig = {
     'GCC_PREPROCESSOR_DEFINITIONS' =>