Fixes dependency versions.

Author: kzaher

Differentiator.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "Differentiator"
-  s.version          = "5.0.0"
+  s.version          = "4.0.0"
   s.summary          = "Diff algorithm for UITableView and UICollectionView."
   s.description      = <<-DESC
   Diff algorithm for UITableView and UICollectionView.

RxDataSources.podspec

@@ -37,7 +37,7 @@ data
   s.swift_version    = '5.0'
 
   s.source_files = 'Sources/RxDataSources/**/*.swift'
-  s.dependency 'Differentiator', '~> 5.0'
+  s.dependency 'Differentiator', '~> 4.0'
   s.dependency 'RxSwift', '~> 5.0'
   s.dependency 'RxCocoa', '~> 5.0'