- Update to 20.2.0:
  Backward-incompatible changes:
  * Python 2.7 and 3.5 aren't supported anymore. The package meta
    data should ensure that you keep getting 20.1.0 on those versions. #244
  * structlog is now fully type-annotated. This won't break your
    applications, but if you use Mypy, it will most likely break your CI.
  Deprecations:
  * Accessing the _context attribute of a bound logger is now deprecated.
    Please use the new structlog.get_context().
  Changes:
  * structlog has now type hints for all of its APIs! Since structlog
    is highly dynamic and configurable, this led to a few concessions
    like a specialized structlog.stdlib.get_logger() whose only difference
    to structlog.get_logger() is that it has the correct type hints.
    We consider them provisional for the time being – i.e. the backward
    compatibility does not apply to them in its full strength until we
    feel we got it right. Please feel free to provide feedback! #223, #282
  * Added structlog.make_filtering_logger that can be used like
    configure(wrapper_class=make_filtering_bound_logger(logging.INFO)).
    It creates a highly optimized bound logger whose inactive methods
    only consist of a return None. This is now also the default logger.
  * As a complement, structlog.stdlib.add_log_level() can now
    additionally be imported as structlog.processors.add_log_level
    since it just adds the method name to the event dict.
  * structlog.processors.add_log_level() is now part of the default configuration.
  * structlog.stdlib.ProcessorFormatter no longer uses exceptions for
    control flow, allowing foreign_pre_chain processors to use
    sys.exc_info() to access the real exception.
  * Added structlog.BytesLogger to avoid unnecessary encoding round trips.
    Concretely this is useful with orjson which returns bytes. #271

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