Update readme.md for windows compatibility.

[watchtheblur]

Using python interpreter instead of bash because it ignores line endings and will work on all platforms.

The original line is:
$ docker-compose run --rm app python ./manage.py

This will fail because Git for Windows will convert all line endings to CRLF (\r\n) and bash will not understand the shebang line in manage.py. This is the error it returns:

/usr/bin/env: 'python\r': No such file or directory

[codecov]

Codecov Report

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The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #147   +/-   ##
=======================================
  Coverage        ?   83.70%           
=======================================
  Files           ?       29           
  Lines           ?      491           
  Branches        ?        0           
=======================================
  Hits            ?      411           
  Misses          ?       80           
  Partials        ?        0           

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