coleifer/huey 2.0.0

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This section describes the changes in the 2.0.0 release. A detailed list of
changes can be found here: https://huey.readthedocs.io/en/latest/changes.html

Overview of changes:

• always_eager mode has been renamed to immediate mode. Unlike previous
  versions, immediate mode involves the same code paths used by the consumer
  process. This makes it easier to test features like task revocation and task
  scheduling without needing to run a dedicated consumer process. Immediate
  mode uses an in-memory storage layer by default, but can be configured to use
  "live" storage like Redis or Sqlite.
• The events stream API has been removed in favor of simpler callback-driven
  signals APIs. These
  callbacks are executed synchronously within the huey consumer process.
• A new serialization format is used in 2.0.0, however consumers running 2.0
  will continue to be able to read and deserialize messages enqueued by Huey
  version 1.11.0 for backwards compatibility.
• Support for task priorities.
• New Serializer abstraction allows users to customize the serialization
  format used when reading and writing tasks.
• Huey consumer and scheduler can be more easily run within the application
  process, if you prefer not to run a separate consumer process.
• Tasks can now specify an on_error handler, in addition to the
  previously-supported on_complete handler.
• Task pipelines return a special ResultGroup object which simplifies reading
  the results of a sequence of task executions.
• SqliteHuey has been promoted out of contrib, onto an equal footing with
  RedisHuey. To simplify deployment, the dependency on
  peewee was removed and the Sqlite
  storage engine uses the Python sqlite3 driver directly.