Add missing package-lock.json.

Author: MichMich

CHANGELOG.md

@@ -2,6 +2,11 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [2.2.2] - 2018-01-02
+
+### Added
+
+- Add missing `package-lock.json`.
 
 ## [2.2.1] - 2018-01-01