v1.6.0 - fiber execution mode (with Async)

A long-awaited feature thanks to @crmne on this release: instead of using a thread pool to run jobs in multiple threads per works, you can now use fibers on a single fiber reactor thread. To use this, you just need to specify the number of fibers instead of the number of threads in your worker configuration, like this: workers : - queues : " api* " fibers : 100 polling_interval : 0.05 It uses Async under the hood, so you need to have that as a dependency for it to work. Also, you need to be u...