Add v3.4.2 to CHANGELOG

[ci skip]

CHANGELOG.md

@@ -1,9 +1,16 @@
 # Ember Changelog
 
+### v3.4.2 (September 24, 2018)
+
+- [#16860](https://github.com/emberjs/ember.js/pull/16860) [BUGFIX] Clear chains in ProxyMixin when destroyed
+- [#16999](https://github.com/emberjs/ember.js/pull/16999) [BUGFIX] Fix mouseEnter/Leave event delegation without jQuery
+
 ### v3.4.1 (September 10, 2018)
+
 - [#16933](https://github.com/emberjs/ember.js/pull/16933) [BUGFIX] Update glimmer-vm packages to 0.38.8
 
 ### v3.4.0 (August 27, 2018)
+
 - [#16603](https://github.com/emberjs/ember.js/pull/16603) [BUGFIX] Support mouseEnter/Leave events w/o jQuery
 - [#16857](https://github.com/emberjs/ember.js/pull/16857) [BUGFIX] Prevents the recursive redefinition of root chains
 - [#16854](https://github.com/emberjs/ember.js/pull/16854) [BUGFIX] Don't thread FactoryManager through createComponent