Update CHANGELOG.md

Author: scott-xu

CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [3.3.1] - 2018-5-22
+
+### Added
+ - Add Ninject.Web.Common.cs in Ninject.Web.Common.WebHost package
+
 ## [3.3.0] - 2017-10-23
 
 ### Added
@@ -38,4 +43,4 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [3.0.0.0]
 - Inintial release: This package is the base for all web extensions.
-- Changed: OnePerRequestModule has been renamed to OnePerRequestHttpModule 
+- Changed: OnePerRequestModule has been renamed to OnePerRequestHttpModule