Changes between 4.2.1 and 4.2.2

This is a maintenance release that includes a bug fix in TLS when using NIO mode and a bug fix in the RpcClient. It's backward compatible with the 4.x.x series and users of those series are encouraged to use this release.

Thanks to Dmitry Andrianov for his contribution on this release.

Always flip ByteBuffer when consuming large messages on TLS

GitHub issue: #307

Check for null blocker in RpcClient

GitHub issue: #306