Add quotation marks to resolve no module found

[Jfaler]

No module named 'djoser.webauthn' found. Adding pip install 'djoser[webauthn]' resolves the issue.

[codecov[bot]]

Codecov Report

Merging #667 (a948826) into master (bacf083) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #667   +/-   ##
=======================================
  Coverage   99.02%   99.02%           
=======================================
  Files          26       26           
  Lines         820      820           
=======================================
  Hits          812      812           
  Misses          8        8           

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