version: bump version to v0.19.1-beta

Author: alexbosworth

release_notes.md

@@ -16,11 +16,8 @@ This file tracks release notes for the loop client.
 
 #### New Features
 
-* User-specified liquidity parameters are persisted on disk to enable the
-  liquidity manager's config to surive after a restart.
-
 #### Breaking Changes
 
 #### Bug Fixes
-* The `SuggestSwaps` rpc now returns the correct peer pubkeys in the disqualified  list.
+
 #### Maintenance