Update Sync.podspec

Author: 3lvis

Sync.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
 s.name             = "Sync"
-s.version          = "3.3.1"
+s.version          = "4.0.0"
 s.summary          = "Modern Swift JSON synchronization to Core Data"
 s.description      = <<-DESC
 **Sync** eases your everyday job of parsing a `JSON` response and getting it into Core Data. It uses a convention-over-configuration paradigm to facilitate your workflow.