Support for `python_2_unicode_compatible` decorator removed in Django 3

[atlasstrategic]

@PiDelport I have tested this simple patch in my project successfully (Python version 3.6.6 and Django==3.0.2).

I have however not run the test suite nor have I removed the use of the six module, in case you still want to continue support for Python 2.

References

• I've found this Django commit rather useful. It shows how the Django maintainers removed the six module.
• As mentioned in Issue #14 the django-registration Django 3 support shows how they have removed the use of python_2_unicode_compatible.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@9c14aec). Click here to learn what that means. The diff coverage is 40.00%.

:exclamation: Current head 4f7a308 differs from pull request most recent head 8c6580b. Consider uploading reports for the commit 8c6580b to get more accurate results

@@            Coverage Diff            @@
##             master      #15   +/-   ##
=========================================
  Coverage          ?   89.50%           
=========================================
  Files             ?       12           
  Lines             ?      486           
  Branches          ?       44           
=========================================
  Hits              ?      435           
  Misses            ?       39           
  Partials          ?       12           

Impacted Files	Coverage Δ
payfast/models.py	93.22% <40.00%> (ø)

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