Bump version to 2.2.0

Author: devxoul

Toaster.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "Toaster"
-  s.version      = "2.1.1"
+  s.version      = "2.2.0"
   s.summary      = "Toast for Swift"
   s.homepage     = "http://github.com/devxoul/Toaster"
   s.license      = { :type => 'WTPFL', :file => 'LICENSE' }
@@ -11,4 +11,5 @@ Pod::Spec.new do |s|
   s.source_files = 'Sources/*.{swift,h}'
   s.frameworks   = 'UIKit', 'Foundation', 'QuartzCore'
   s.requires_arc = true
+  s.swift_version = "5.0"
 end