Rq

* `Job.fetch()` now properly handles unpickleable return values. Thanks selwin!

* `enqueue_at()` and `enqueue_in()` now sets job status to `scheduled`. Thanks coolhacker170597!
* Failed jobs data are now automatically expired by Redis. Thanks selwin!
* Fixes `RQScheduler` logging configuration. Thanks FlorianPerucki!

* This release also contains an alpha version of RQ's builtin job scheduling mechanism. Thanks selwin!
* Various internal API changes in preparation to support multiple job dependencies. Thanks thomasmatecki!
* `--verbose` or `--quiet` CLI arguments should override `--logging-level`. Thanks zyt312074545!
* Fixes a bug in `rq info` where it doesn't show workers for empty queues. Thanks zyt312074545!
* Fixed `queue.enqueue_dependents()` on custom `Queue` classes. Thanks van-ess0!
* `RQ` and Python versions are now stored in job metadata. Thanks eoranged!
* Added `failure_ttl` argument to job decorator. Thanks pax0r!

- Added `max_jobs` to `Worker.work` and `--max-jobs` to `rq worker` CLI. Thanks perobertson!
- Passing `--disable-job-desc-logging` to `rq worker` now does what it's supposed to do. Thanks janierdavila!
- `StartedJobRegistry` now properly handles jobs with infinite timeout. Thanks macintoshpie!
- `rq info` CLI command now cleans up registries when it first runs. Thanks selwin!
- Replaced the use of `procname` with `setproctitle`. Thanks j178!

- Django 2.0 compatibility fixes.
- Minor bug fixes

Backward incompatible changes:

- `job.status` has been removed. Use `job.get_status()` and `job.set_status()` instead. Thanks selwin!

- `FailedQueue` has been replaced with `FailedJobRegistry`:
* `get_failed_queue()` function has been removed. Please use `FailedJobRegistry(queue=queue)` instead.
* `move_to_failed_queue()` has been removed.
* RQ now provides a mechanism to automatically cleanup failed jobs. By default, failed jobs are kept for 1 year.
* Thanks selwin!

- RQ's custom job exception handling mechanism has also changed slightly:
* RQ's default exception handling mechanism (moving jobs to `FailedJobRegistry`) can be disabled by doing `Worker(disable_default_exception_handler=True)`.
* Custom exception handlers are no longer executed in reverse order.
* Thanks selwin!

- `Worker` names are now randomized. Thanks selwin!

- `timeout` argument on `queue.enqueue()` has been deprecated in favor of `job_timeout`. Thanks selwin!

- Sentry integration has been reworked:
* RQ now uses the new [sentry-sdk](https://pypi.org/project/sentry-sdk/) in place of the deprecated [Raven](https://pypi.org/project/raven/) library
* RQ will look for the more explicit `RQ_SENTRY_DSN` environment variable instead of `SENTRY_DSN` before instantiating Sentry integration
* Thanks selwin!

- Fixed `Worker.total_working_time` accounting bug. Thanks selwin!