Requirement is pinned: cachetools~=2.0.1

[MartinHjelmare]

• This library supports an integration in Home Assistant.
• The upcoming pip resolver will be more strict in resolving package version conflicts: http://pyfound.blogspot.com/2020/03/new-pip-resolver-to-roll-out-this-year.html#what-will-change
• To avoid future issues it would be good if this library would change its pinning to allow any higher version and just set a minimum version.

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