Bump podspec version to 0.4.2

Diff.podspec

@@ -1,12 +1,12 @@
 Pod::Spec.new do |s|
   s.name         = "Diff"
-  s.version      = "0.4.1"
+  s.version      = "0.4.2"
   s.summary      = "The fastest Diff library in Swift. Includes UICollectionView/UITableView utils."
   s.homepage     = "https://github.com/wokalski/Diff.swift"
   s.description  = <<-DESC
 This library generates differences between any two Collections (and Strings). It uses a fast algorithm (O((N+M)*D)). It also includes utilities for UICollectionView/UITableView.
                    DESC
-  
+
   s.license      = { :type => "MIT", :file => "LICENSE" }
 
   s.author             = { "Wojtek Czekalski" => "[email protected]" }
@@ -15,8 +15,8 @@ This library generates differences between any two Collections (and Strings). It
   s.platforms = { :ios => "8.0", :osx => "10.10", :tvos => "9.0", :watchos => "3.0" }
   s.osx.exclude_files = "Sources/Diff+UIKit.swift"
   s.watchos.exclude_files = "Sources/Diff+UIKit.swift"
-    
-  s.source       = { :git => "https://github.com/wokalski/Diff.swift.git", :tag => "0.4.1" }
+
+  s.source       = { :git => "https://github.com/wokalski/Diff.swift.git", :tag => "0.4.2" }
 
   s.source_files  = "Sources"
 end