Fix click v7 version_option compatibility

[FuegoFro]

It looks like the ternary was committed backwards in #1400, since the package_name option was add in click 8, but is only being passed in click 7. That caused pip-tools to error on import when installed alongside click 7.

Changelog-friendly one-liner: Follow up #1400 to fix click v7 compatibility.

Contributor checklist

• Provided the tests for the changes.
• Gave a clear one-line description in the PR (that the maintainers can add to CHANGELOG.md on release).
• Assign the PR to an existing or new milestone for the target version (following Semantic Versioning).

[FuegoFro]

Hey there! I wasn't sure how to set a milestone or what milestone should even be set (possibly 6.1.1, just since that's the milestone which was set on #1400?). Would love some help with that!

Also, I wasn't sure whether I should add a new tox env to tests this, let me know if you think that'd be valuable!

[nicoa]

you're totally right, good catch! As far as I know, only members of the jazzband organisation can set milestones, I added 6.1.1 for now, agreeing that this makes sense.

Regarding the tox env: I honestly don't know whether it's overkill or highly appreciated to test different click versions, maybe others have a strong opinion on this.

[codecov]

Codecov Report

Merging #1410 (0d6e942) into master (6ed9301) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1410   +/-   ##
=======================================
  Coverage   99.67%   99.67%           
=======================================
  Files          34       34           
  Lines        3042     3042           
  Branches      327      327           
=======================================
  Hits         3032     3032           
  Misses          5        5           
  Partials        5        5           

Impacted Files	Coverage Δ
piptools/scripts/compile.py	100.00% <100.00%> (ø)
piptools/scripts/sync.py	100.00% <100.00%> (ø)

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[webknjaz]

This will probably need to be synced with master to unblock the merge button.

[FuegoFro]

Thank you for the quick review! 😀 I've gone ahead and rebased the branch on latest master 🙂