Update Django 4 documentation

[sergioisidoro]

Django 4 django.conf.urls.url() is removed in favour of re_path or path

[codecov]

Codecov Report

Merging #119 (6855239) into master (70da760) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   79.85%   79.85%           
=======================================
  Files           7        7           
  Lines         134      134           
  Branches       13       22    +9     
=======================================
  Hits          107      107           
  Misses         20       20           
  Partials        7        7           

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[tony]

@sergioisidoro Good catch! Thank you for this!

[tony]

Even those this is on the docs side, if you'd like to try the prerelease it's on pypi now at 5.0b1

Would appreciate some testers!