Log Message:
Update to 0.84

Upstream changes:
Version 0.84 (2020-11-23)
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* skip threads testing on 5.9.5 and 5.10.0 as
  Perl_clone() segfaults for these releases

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Version 0.83 (2020-11-19)
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* more Windows fixes

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Version 0.82 (2020-11-19)
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* fix speed tests (the new smaller code was parsing too
  quickly for caching to have a strong impact)

* update documentation, e.g. bugtracker

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Version 0.81 (2020-11-18)
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* fix parallel builds

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Version 0.80 (2020-11-17)
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* fix 602_threads.t