Bump version to 2.4.0

URLNavigator.podspec

@@ -1,17 +1,17 @@
 Pod::Spec.new do |s|
   s.name             = "URLNavigator"
-  s.version          = "2.3.0"
+  s.version          = "2.4.0"
   s.summary          = "⛵️ Elegant URL Routing for Swift"
   s.homepage         = "https://github.com/devxoul/URLNavigator"
   s.license          = { :type => "MIT", :file => "LICENSE" }
-  s.author           = { "Suyeol Jeon" => "[email protected]" }
+  s.author           = { "Suyeol Jeon" => "[email protected]", "Kanghoon Oh" => "[email protected]" }
   s.source           = { :git => "https://github.com/devxoul/URLNavigator.git",
                          :tag => s.version.to_s }
   s.source_files     = "Sources/**/*.swift"
   s.frameworks       = 'UIKit', 'Foundation'
   s.requires_arc     = true
   s.swift_version    = "5.0"
 
-  s.ios.deployment_target = "8.0"
+  s.ios.deployment_target = "9.0"
   s.tvos.deployment_target = "9.0"
 end