Fix #70: Deprecate CsrfMiddlware class and add CsrfTokenMiddleware instead

[ev-gor]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

Fix #70

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.10%. Comparing base (5d18903) to head (7d98cac).
Report is 12 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff               @@
##              master      #71       +/-   ##
==============================================
- Coverage     100.00%   77.10%   -22.90%     
- Complexity        47       61       +14     
==============================================
  Files              8        9        +1     
  Lines            128      166       +38     
==============================================
  Hits             128      128               
- Misses             0       38       +38     

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[ev-gor]

I just copy/paste existing code, but I can add missing tests if needed

[samdark]

@ev-gor deprecated class could be excluded from testing.

[vjik]

@ev-gor deprecated class could be excluded from testing.

Why? It's reduced code coverage. I suggest removing tests for deprecate classes at the time of their deletion.

[samdark]

Alright. @vjik suggestion makes sense.