Fix create_command() import

[atugushev]

It should be imported directly from pip._internal.commands.
See PR pypa/pip#7061 which breaks pip-tools.

Changelog-friendly one-liner: Add compatibility with pip==19.3.

Contributor checklist

• Provided the tests for the changes.
• Requested a review from another contributor.
• 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).

[codecov]

Codecov Report

Merging #912 into master will increase coverage by 0.48%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #912      +/-   ##
==========================================
+ Coverage   98.57%   99.06%   +0.48%     
==========================================
  Files          35       35              
  Lines        2247     2247              
  Branches      288      288              
==========================================
+ Hits         2215     2226      +11     
+ Misses         21       13       -8     
+ Partials       11        8       -3

Impacted Files	Coverage Δ
piptools/utils.py	100% <100%> (+2.04%)	⬆️
piptools/repositories/pypi.py	95.12% <0%> (+3.9%)	⬆️

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[codingjoe]

Haha, I didn't know what I'm getting myself into. Seems I'm the official reviewer now 🤣
Keep 'em coming, I don't really mind 😄

[atugushev]

@codingjoe

Haha, I didn't know what I'm getting myself into. Seems I'm the official reviewer now 🤣
Keep 'em coming, I don't really mind 😄

Sorry for highlighting you on every compatibility fix. Thank you so much for the reviews! The clock is ticking, so I rush the fixes :)

[codingjoe]

All good, but I am gone hiking in Yosemite for a couple days. Soo it'll take some days until I'm back online.

[atugushev]

@codingjoe

I hope it'll be the last compatibility fix! Have a nice weekend then! 👍🥾