Actix-Web v3.0

Congratulations to the team. I've been working on an actix-web service for my job for ~6 months now, and it's generally been very pleasant. I'm really excited at how well the transition from a single maintainer to a community-run project has gone. The actix team have been great at answering questions on Gitter.

Today I was debugging a memory leak, and tracked it down to creating multiple awc::Clients. I found the commit that fixed it, assumed it was in one of the 3.0 beta branches, and prepared myself for a long, boring conversation with my coworkers about whether we were prepared to use a beta release. And then I checked and 3.0 had been released only an hour ago! Great timing.