Update CHANGELOG and bump version

Author: Michael Sanders

CHANGELOG.md

@@ -3,6 +3,11 @@
 All notable changes to this project will be documented in this file.
 `TrueTime.swift` adheres to [Semantic Versioning](http://semver.org/).
 
+## [4.1.0](https://github.com/instacart/TrueTime.swift/releases/tag/4.1.0)
+
+- Added: Now posting notification when reference time gets updated
+- Fixed: Fixed crash when receiving empty packets from certain hosts.
+
 ## [4.0.0](https://github.com/instacart/TrueTime.swift/releases/tag/4.0.0)
 
 - Added: Swift 3 support.

TrueTime.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'TrueTime'
-  s.version = '4.0.0'
+  s.version = '4.1.0'
   s.summary = 'NTP library for Swift. Get the true time impervious to device clock changes.'
 
   s.homepage = 'https://github.com/instacart/TrueTime.swift'