Release v4.1.1 · share/sharedb-mongo

What's Changed

Fix $map query transform by @ericyhwang in #154
- It would just hang previously. It's very likely unused by any consumers, but it's not much code to keep support for it.
Resolve memory leak when using cursor operations like $count in mongodb@4-6 by @ericyhwang in #152
- This mostly affected $count. $explain was affected as well, though that usually won't be used in a production service.
- ⚠️ If you also use the Mongo Node driver directly:
  - Be warned that, while this patches the memory leak when using sharedb-mongo, directly using the underlying Node driver can still leak sessions when using cursor.count() or cursor.explain().
  - On Mongo's end, it's tracked in https://jira.mongodb.org/browse/NODE-4833 and https://jira.mongodb.org/browse/NODE-4845.
- Thanks to @deongroenewald for the report and repro case!

Full Changelog: v4.1.0...v4.1.1