Bump version to 4.0.0

Author: keith

CHANGELOG.md

@@ -2,6 +2,9 @@
 All notable changes to this project will be documented in this file.
 `Kronos` adheres to [Semantic Versioning](http://semver.org/).
 
+## [4.0.0](https://github.com/lyft/Kronos/releases/tag/4.0.0)
+- Update for Swift 5
+
 ## [3.0.1](https://github.com/lyft/Kronos/releases/tag/3.0.1)
 - Don't restore timestamps from the cache after a reboot
 - Expose sync age through `Clock.annotatedNow`

Kronos.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'Kronos'
-  s.version = '3.0.1'
+  s.version = '4.0.0'
   s.license = { :type => 'Apache License, Version 2.0', :file => 'LICENSE' }
   s.summary = 'Elegant NTP client in Swift'
   s.homepage = 'https://github.com/lyft/Kronos'