Bump version to 3.0.6

Author: kizitonwose

.swift-version

@@ -1,12 +1,13 @@
 Pod::Spec.new do |spec|
 
   spec.name         = "CountryPickerView"
-  spec.version      = "3.0.5"
+  spec.version      = "3.0.6"
   spec.summary      = "A simple, customizable view for selecting countries in iOS apps."
   spec.homepage     = "https://github.com/kizitonwose/CountryPickerView"
   spec.license      = "MIT"
   spec.author       = { "Kizito Nwose" => "kizitonwose@gmail.com" }
   spec.platform     = :ios, "8.0"
+  spec.swift_version   = '5.0'
   spec.source       = { :git => "https://github.com/kizitonwose/CountryPickerView.git", :tag => spec.version }
   spec.source_files  = "CountryPickerView/**/*.{swift}"
   spec.resource_bundles = {