Dragonfly 0.9.1

A patch release fixing a possible deadlock when running with epoll API.

What's Changed

• feat(server): Implement MEMORY MALLOC-STATS command by @romange in #363
• chore(test): Allow running tests with epoll proactor by @romange in #364
• fix(epoll): pull newest helio dependency by @romange in #366

Full Changelog: v0.9.0...v0.9.1