added another limitations to changelog

CHANGELOG.md

@@ -3,9 +3,12 @@
 ## Initial release
 
 Implemented first and basic plugin that serves as BGP information provider. It uses [GoBGP](https://github.com/osrg/gobgp) library as 
-source of the BGP information and it provides only the reachable IP routes. Further information about this implementation can be found [here](https://github.com/ligato/bgp-agent/tree/master/bgp/gobgp).
+source of the BGP information and it provides only the reachable IPv4 routes. Further information about this implementation can be found [here](https://github.com/ligato/bgp-agent/tree/master/bgp/gobgp).
 
 Release also contains [basic example of usage](https://github.com/ligato/bgp-agent/tree/master/examples/gobgp_watch_plugin) of this plugin implementation.
 
 ## Known Issues
 Use cases regarding dropping connection and reconnection of the Route reflector(BGP node used that plugin uses for getting BGP information) are not taken into account. 
+
+## Known Limitiations
+The BGP information flow is one directional. We can not advertise the BGP information to the BGP network nodes.