Update CHANGELOG.md

Author: vmutafov

CHANGELOG.md

@@ -6,6 +6,7 @@
 - [Arabic and Kurdish characters show as gibberish in console.log() (#1302)](https://github.com/NativeScript/android-runtime/issues/1302)
 - [IntentService extending fails at runtime when service is started (#1426)](https://github.com/NativeScript/android-runtime/issues/1426)
 - [SBG may fail when parsing big JS files (#1430)](https://github.com/NativeScript/android-runtime/issues/1430)
+- [Upgrade android gradle plugin to the latest 3.4.2 version (#1425)](https://github.com/NativeScript/android-runtime/issues/1425)