Set plugin.xml version to match the package.json version

Author: echo-branch

plugin.xml

@@ -24,7 +24,7 @@ SOFTWARE.
 <plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
   xmlns:android="http://schemas.android.com/apk/res/android"
   id="branch-cordova-sdk"
-  version="4.1.2">
+  version="4.2.0">
 
   <!-- Description -->
   <name>branch-cordova-sdk</name>