- Update to 2.8.1:
  * Updated tzdata version to 2019c.
  * Fixed a race condition in the tzoffset and tzstr "strong"
    caches on Python 2.7. Reported by @kainjow (gh issue #901).
  * Parsing errors will now raise ParserError, a subclass of
    ValueError, which has a nicer string representation. Patch by
    @gfyoung (gh pr #881).
  * parser.parse will now raise TypeError when tzinfos is passed a
    type that cannot be interpreted as a time zone. Prior to this
    change, it would raise an UnboundLocalError instead. Patch by
    @jbrockmendel (gh pr #891).
  * Changed error message raised when when passing a bytes object as
    the time zone name to gettz in Python 3. Reported and fixed by
    @labrys () (gh issue #927, gh pr #935).
  * Changed compatibility logic to support a potential Python 4.0
    release. Patch by Hugo van Kemenade (gh pr #950).
  * Updated many modules to use tz.UTC in favor of tz.tzutc()
    internally, to avoid an unnecessary function call. (gh pr #910).
  * Fixed issue where dateutil.tz was using a backported version of
    contextlib.nullcontext even in Python 3.7 due to a malformed
    import statement. (gh pr #963).

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