Changes between 4.8.3 and 4.9.0

This is a maintenance release with 2 new features and a bug fix. All users of the 4.x.x and 3.6.x series are encouraged to upgrade to this version.

Add traffic listener

GitHub issue: #411

Connection recovery runs into timeouts when using NIO

GitHub issue: #413

Provide factories to create NIO artefacts

GitHub issue: #410