Changelog updates for split Xlink channels and router identity in Xlink establishment.
# Release 0.20.7
+## What's New
+
+* Xlink now supports to a boolean `split` option to enable/disable separated payload and ack channels.
+* Router identity now propagated through the link establishment plumbing. Will facilitate router-directed `transport.Configuration` profiles in a future release.
* Bug fix: tunneler identity appData wasn't propagated to tunneler/router
+### Split Xlink Payload/Ack Channels
+
+Split payload and ack channels are enabled by default, preserving the behavior of previous releases. To disable split channels, merge the following stanza into your router configuration:
+
+```
+link:
+ dialers:
+ - binding: transport
+ split: false
+```
+
# Release 0.20.6
## What's New
