Remove unnecessary version constraint for click

[lukasbindreiter]

As far as I can tell no click features are used that prevent an upgrade to v8 of click.

See #1590 for more info as to why this is necessary.

Related PR: executablebooks/sphinx-external-toc#69

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[choldgraf]

This seems reasonable to me as long as all of the tests are happy!

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Codecov Report

Merging #1623 (71ebdd5) into master (4e90fa1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1623   +/-   ##
=======================================
  Coverage   91.30%   91.30%           
=======================================
  Files           7        7           
  Lines         690      690           
=======================================
  Hits          630      630           
  Misses         60       60           

Flag	Coverage Δ
pytests	91.30% <ø> (ø)

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