Releasing v0.6.0

Changelog updated

Release 0.4.1

0.4.0-rc.2 pre-release

0.4.0 final release

0.4.0-rc.2 pre-release

Pre-release of version 0.4.0.

* websocket handling of 'ping', 'pong' and 'close' messages

* websocket not crashing on binary messages
* websocket returning text rather than base64
* restored `nym-client` lib functionality