pip-tools should be installed in the project's virtual environment

[tekumara]

Fix #1021

Changelog-friendly one-liner: Make the readme more imperative about installing into a project's virtual environment to avoid confusion

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).

[codecov]

Codecov Report

Merging #1023 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1023   +/-   ##
=======================================
  Coverage   99.11%   99.11%           
=======================================
  Files          34       34           
  Lines        2364     2364           
  Branches      303      303           
=======================================
  Hits         2343     2343           
  Misses         11       11           
  Partials       10       10

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[atugushev]

Thanks for your contribution! Generally looks good to me. One thing which bothers me, maybe the details should be explained in its own sections for pip-compile and pip-sync?

[tekumara]

@atugushev I've moved the details into the suggested sections, how does it look now?

[atugushev]

Thanks for the update! I'll approve this, but I'd like to hear an opinion from someone else since I'm not a native English speaker.

[atugushev]

@tekumara, thanks for your first-time contribution and welcome to the pip-tools contributors 😊 Nicely done!