Add async view support

[jrobichaud]

Fixes #179

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (fe8452a) compared to base (63bdb4d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #180   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           41        41           
  Lines         1211      1254   +43     
=========================================
+ Hits          1211      1254   +43     

Impacted Files	Coverage Δ
django_structlog/middlewares/request.py	100.00% <100.00%> (ø)
...go_structlog_demo_project/home/tests/test_views.py	100.00% <100.00%> (ø)
django_structlog_demo_project/home/views.py	100.00% <100.00%> (ø)
test_app/tests/middlewares/test_request.py	100.00% <100.00%> (ø)

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