Merge pull request #332 from pusher/encrypted-channel-js-support

added reference to new with-encryption builds

Author: benw-pusher

docs/channels/using_channels/encrypted-channels.md

@@ -154,6 +154,7 @@ Library support is limited to those listed below. If you want to use encrypted c
 [pusher-js](https://github.com/pusher/pusher-js)
 
 - Supported from version 4.3.0
+- From [version 6.0.0](https://github.com/pusher/pusher-js/blob/master/CHANGELOG.md#600-2020-04-27) ensure you are importing the `pusher-with-encryption` build. 
 
 [pusher-angular](https://github.com/pusher/pusher-angular)