chore: prepare 4.0.1 release

Author: evilebottnawi

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](http://semver.org).
 
+## 4.0.1 - 2018-04-23
+
+* Fixed: support `webpack@4`.
+
 ## 4.0.0 - 2017-11-22
 
 * Feature: adds ability to pass `configure` as `nunjucks.Environment`.