Update CHANGES.md
rosie.ws_client: new prefixes-ws-default setting

Limit default lookup, etc to a subset of prefixes.
rosie web: all_revs=1 instead of all_revs=on
Merge pull request #1442 from matthewrmshin/rosie-web-all-revs-on

rosie web: all_revs=1 instead of all_revs=on
Merge pull request #1438 from matthewrmshin/rosie-prefixes-ws-default

rosie.ws_client: new prefixes-ws-default setting