README: Remove non-ascii characters

[AbdealiLoKo]

Make the README pure ascii (remove non-ascii characters) to avoid UnicodeDecodeError issues in some systems.

Fixes #815

Changelog-friendly one-liner: Fix issues with UnicodeError when installing from source in some systems.

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

@@           Coverage Diff           @@
##           master     #816   +/-   ##
=======================================
  Coverage   98.83%   98.83%           
=======================================
  Files          36       36           
  Lines        2153     2153           
  Branches      276      276           
=======================================
  Hits         2128     2128           
  Misses         15       15           
  Partials       10       10

---

Continue to review full report at Codecov.

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[codecov]

Codecov Report

Merging #816 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #816   +/-   ##
=======================================
  Coverage   98.83%   98.83%           
=======================================
  Files          36       36           
  Lines        2153     2153           
  Branches      276      276           
=======================================
  Hits         2128     2128           
  Misses         15       15           
  Partials       10       10

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 804d780...8a6bca8. Read the comment docs.

[atugushev]

Good catch! Thanks for fixing this.

[atugushev]

pip-tools v3.8.0 is released