Release 2.2.1

Swifter.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name         = "Swifter"
-  s.version      = "2.2.0"
+  s.version      = "2.2.1"
   s.summary      = ":bird: A Twitter framework for iOS & macOS written in Swift"
   s.description  = <<-DESC
   Twitter framework for iOS & macOS written in Swift, with support of three different types of authentication protocol, and most, if not all, of the REST API.
@@ -14,6 +14,6 @@ Pod::Spec.new do |s|
   s.osx.deployment_target = "10.10"
   s.source       = { :git => "https://github.com/mattdonnelly/Swifter.git", :tag => "#{s.version}" }
   s.source_files  = "Sources/*.swift"
-
+  s.swift_version = "4.1"
 
 end