Correct package installation instructions

[cedricziel]

Correct a mistake in the Readme :)

[codecov]

Codecov Report

Merging #203 (85a00cd) into main (c9ed6b0) will not change coverage.
The diff coverage is n/a.

❗ Current head 85a00cd differs from pull request most recent head 5c37a24. Consider uploading reports for the commit 5c37a24 to get more accurate results

@@            Coverage Diff            @@
##               main     #203   +/-   ##
=========================================
  Coverage     33.13%   33.13%           
  Complexity      852      852           
=========================================
  Files            76       76           
  Lines          3247     3247           
=========================================
  Hits           1076     1076           
  Misses         2171     2171           

Flag	Coverage Δ
7.4	46.34% <ø> (ø)
8.0	33.06% <ø> (ø)
8.1	33.10% <ø> (ø)
8.2	33.08% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c9ed6b0...5c37a24. Read the comment docs.