Fixes #72: Add django 3 support

[daniel-ruiz]

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Enable easy_pdf to be installed in Django 3.0 by dropping the dependency of django.utils.six module, which is no longer present in Django 3.0.

Instead, the classes that need compatibility with Python 2 have been added to the new compat module.

Fixes #72

[openHBP]

Would it be possible to integrate this please?

[geolffreym]

@openHBP try creating your own fork of the project.. look like isnt maintened anymore.. or just install from my fork pip install git+git://github.com/geolffreym/django-easy-pdf.git#egg=django-easy-pdf

[geolffreym]

@daniel-ruiz commit this fix since 2019 """"damn"""" this is not maintained project!!

[LutfiZakaria]

#75 Owwh, there is some update about this

[schwartzadev]

Would love to see this resolved as well!