Bump celery from 4.2.2 to 4.3.0

[dependabot-preview]

Bumps celery from 4.2.2 to 4.3.0.

Changelog

Sourced from celery's changelog.

4.3.0

:release-date: 2019-03-31 7:00 P.M UTC+3:00
:release-by: Omer Katz

• Added support for broadcasting using a regular expression pattern
  or a glob pattern to multiple Pidboxes.

  This allows you to inspect or ping multiple workers at once.

  Contributed by Dmitry Malinovsky & Jason Held

• Added support for PEP 420 namespace packages.

  This allows you to load tasks from namespace packages.

  Contributed by Colin Watson

• Added :setting:acks_on_failure_or_timeout as a setting instead of
  a task only option.

  This was missing from the original PR but now added for completeness.

  Contributed by Omer Katz

• Added the :signal:task_received signal.

  Contributed by Omer Katz

• Fixed a crash of our CLI that occurred for everyone using Python < 3.6.

  The crash was introduced in acd6025 <https://github.com/celery/celery/commit/acd6025b7dc4db112a31020686fc8b15e1722c67>_
  by using the :class:ModuleNotFoundError exception which was introduced
  in Python 3.6.

  Contributed by Omer Katz

• Fixed a crash that occurred when using the Redis result backend
  while the :setting:result_expires is set to None.

  Contributed by Toni Ruža & Omer Katz

• Added support the DNS seedlist connection format <https://docs.mongodb.com/manual/reference/connection-string/#dns-seedlist-connection-format>_
  for the MongoDB result backend.

  This requires the dnspython package which will be installed by default
  when installing the dependencies for the MongoDB result backend.

  Contributed by George Psarakis

... (truncated)

Commits

• 241d2e8 Bump version: 4.3.0rc3 → 4.3.0
• 40360f1 Update changelog.
• 974b386 Updated wall of contributors.
• 3a7c30c Include extra compression methods in Celery for ease of use.
• fe3e9a3 update sponsor
• b0db28e include tidelift link
• e1f84b0 isort.
• 4db16ba Mention the results_extended settings in the calling user guid
• d970dce Update changelog.
• d1c3ed4 Improve documentation about ignore_result.
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #455 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #455   +/-   ##
=======================================
  Coverage   42.66%   42.66%           
=======================================
  Files          52       52           
  Lines        3223     3223           
=======================================
  Hits         1375     1375           
  Misses       1848     1848

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[coveralls]

Coverage remained the same at 42.662% when pulling 88c9c7f on dependabot/pip/dev/celery-4.3.0 into 1a44b5e on dev.