Update minimal version of click to 7.0

[bgreenwell]

Patch to fix issue #348 regarding incorrect minimal version of click.

[codecov-io]

Codecov Report

Merging #349 (bb730e9) into master (c4a5b91) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #349   +/-   ##
=======================================
  Coverage   84.55%   84.55%           
=======================================
  Files          39       39           
  Lines        2726     2726           
=======================================
  Hits         2305     2305           
  Misses        421      421           

Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)

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[pietern]

Belated thanks for making the fix and posting a PR. We're slowly making our way through the backlog this past month.

The case_sensitive argument was removed in #347.

However, in the mean time we merged #471 which depends on click >= 7.0 for a different reason.