Fixing Test badge.svg and coverage report generation

[andruten]

• Test badge is now visible. An example can be found here: https://github.com/andruten/django-revproxy/workflows/Test/badge.svg

• Fixed codecov report generation

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@56c1337). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head b370eb0 differs from pull request most recent head 7b20681. Consider uploading reports for the commit 7b20681 to get more accurate results

@@            Coverage Diff            @@
##             master     #155   +/-   ##
=========================================
  Coverage          ?   99.32%           
=========================================
  Files             ?        5           
  Lines             ?      295           
  Branches          ?       36           
=========================================
  Hits              ?      293           
  Misses            ?        1           
  Partials          ?        1           

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