Rq

* Added `Callback(on_stopped='my_callback)`. Thanks eswolinsky3241!
* `Callback` now accepts dotted path to function as input. Thanks rishabh-ranjan!
* `queue.enqueue_many()` now supports job dependencies. Thanks eswolinsky3241!
* `rq worker` CLI script now configures logging based on `DICT_CONFIG` key present in config file. Thanks juur!
* Whenever possible, `Worker` now uses `lmove()` to implement [reliable queue pattern](https://redis.io/commands/lmove/). Thanks selwin!
* Require `redis>=4.0.0`
* `Scheduler` should only release locks that it successfully acquires. Thanks xzander!
* Fixes crashes that may happen by changes to `as_text()` function in v1.14. Thanks tchapi!
* Various linting, CI and code quality improvements. Thanks robhudson!

* Fixes a crash that happens if Redis connection uses SSL. Thanks tchapi!
* Fixes a crash if `job.meta()` is loaded using the wrong serializer. Thanks gabriels1234!

* Added `WorkerPool` (beta) that manages multiple workers in a single CLI. Thanks selwin!
* Added a new `Callback` class that allows more flexibility in declaring job callbacks. Thanks ronlut!
* Fixed a regression where jobs with unserializable return value crashes RQ. Thanks tchapi!
* Added `--dequeue-strategy` option to RQ's CLI. Thanks ccrvlh!
* Added `--max-idle-time` option to RQ's worker CLI. Thanks ronlut!
* Added `--maintenance-interval` option to RQ's worker CLI. Thanks ronlut!
* Fixed RQ usage in Windows as well as various other refactorings. Thanks ccrvlh!
* Show more info on `rq info` CLI command. Thanks iggeehu!
* `queue.enqueue_jobs()` now properly account for job dependencies. Thanks sim6!
* `TimerDeathPenalty` now properly handles negative/infinite timeout. Thanks marqueurs404!

* Added `work_horse_killed_handler` argument to `Worker`. Thanks ronlut!
* Fixed an issue where results aren't properly persisted on synchronous jobs. Thanks selwin!
* Fixed a bug where job results are not properly persisted when `result_ttl` is `-1`. Thanks sim6!
* Various documentation and logging fixes. Thanks lowercase00!
* Improve Redis connection reliability. Thanks lowercase00!
* Scheduler reliability improvements. Thanks OlegZv and lowercase00!
* Fixed a bug where `dequeue_timeout` ignores `worker_ttl`. Thanks ronlut!
* Use `job.return_value()` instead of `job.result` when processing callbacks. Thanks selwin!
* Various internal refactorings to make `Worker` code more easily extendable. Thanks lowercase00!
* RQ's source code is now black formatted. Thanks aparcar!

* RQ now stores multiple job execution results. This feature is only available on Redis >= 5.0 Redis Streams. Please refer to [the docs](https://python-rq.org/docs/results/) for more info. Thanks selwin!
* Improve performance when enqueueing many jobs at once. Thanks rggjan!
* Redis server version is now cached in connection object. Thanks odarbelaeze!
* Properly handle `at_front` argument when jobs are scheduled. Thanks gabriels1234!
* Add type hints to RQ's code base. Thanks lowercase00!
* Fixed a bug where exceptions are logged twice. Thanks selwin!
* Don't delete `job.worker_name` after job is finished. Thanks eswolinsky3241!

* `queue.enqueue_many()` now supports `on_success` and on `on_failure` arguments. Thanks y4n9squared!
* You can now pass `enqueue_at_front` to `Dependency()` objects to put dependent jobs at the front when they are enqueued. Thanks jtfidje!
* Fixed a bug where workers may wrongly acquire scheduler locks. Thanks milesjwinter!
* Jobs should not be enqueued if any one of it's dependencies is canceled. Thanks selwin!
* Fixed a bug when handling jobs that have been stopped. Thanks ronlut!
* Fixed a bug in handling Redis connections that don't allow `SETNAME` command. Thanks yilmaz-burak!