Watchtower

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- Use repr to represent all JSON fields of unknown types by default.
Previously, when passing a mapping (dictionary) as a log message,
watchtower would replace datetime objects with their “.isoformat()”
string representation, and would replace all other
non-JSON-serializable objects with ``null``. The new behavior is to
use the output of repr() to represent these non-JSON-serializable
objects. This change may cause your logger to log more data than you
intended, which is why it triggers a major version bump. If you use
watchtower to log sensitive information or objects with large repr
strings, you are advised to examine your log messages to see if any
newly visible data should be sanitized. If you need to customize this
behavior, you can pass a custom JSON default serializer using the
``json_serialize_default`` keyword argument.

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- Use correct default log stream name

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- Deconflict log streams from process pools in default log stream name

- Documentation and CI improvements

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- Update empty message filtering to catch formatted string case (162)

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- Rename log_group to log_group_name for consistency with the Boto3 API

- Rename stream_name to log_stream_name for consistency with the Boto3
API

- Introduce the ability to pass a Boto3 logs client and remove the
ability to pass Boto3 sessions

- Document the ability to pass a Boto3 configuration profile name for
declarative configs

- Remove the Django customization, which was deprecated and unneeded.
Django can use watchtower directly via its logging configuration as
documented in the readme

- Introduce configurable log formatters. Special thanks to
terencehonles for starting this work (117, 138)

- Use logging.Handler.handleError to correctly handle errors while
processing log records (149)

- Move stream name determining logic to separate method (148)

- Reset internal state on fork to prevent deadlocks in worker threads
(139)

- Drop Python 3.5 support

- Expand documentation

- Update test and release infrastructure

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- Catch OperationAbortedException in \_idempotent_create. Fixes 136