Update npm dependencies

Fixes:
- WS-2019-0032 (nodeca/js-yaml#475)
- WS-2019-0063 (nodeca/js-yaml#480)
- WS-2019-0064 (handlebars-lang/handlebars.js@v4.1.1...v4.1.2)

CHANGELOG.md

@@ -4,6 +4,15 @@ 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/).
 
+## [Unreleased](https://github.com/axa-group/oauth2-mock-server/compare/v1.3.0...HEAD)
+
+### Security
+
+- Update `npm` dependencies to fix:
+  - [WS-2019-0032](https://github.com/nodeca/js-yaml/issues/475)
+  - [WS-2019-0063](https://github.com/nodeca/js-yaml/pull/480)
+  - [WS-2019-0064](https://github.com/wycats/handlebars.js/compare/v4.1.1...v4.1.2)
+
 ## [1.3.0](https://github.com/axa-group/oauth2-mock-server/compare/v1.2.0...v1.3.0) — 2019-06-03
 
 ### Added