test with flask blueprints

[abhishek-ram]

2nd PR for issue #2

[codecov-io]

Codecov Report

Merging #16 into master will increase coverage by 1.1%.
The diff coverage is 81.25%.

@@            Coverage Diff            @@
##           master      #16     +/-   ##
=========================================
+ Coverage   87.64%   88.75%   +1.1%     
=========================================
  Files           9        8      -1     
  Lines         251      249      -2     
  Branches       31       31             
=========================================
+ Hits          220      221      +1     
+ Misses         17       14      -3     
  Partials       14       14

Impacted Files	Coverage Δ
src/protean_flask/core/serializers.py	88.88% <ø> (ø)	⬆️
src/protean_flask/core/viewsets.py	100% <100%> (ø)	⬆️
src/protean_flask/cli.py	100% <100%> (ø)	⬆️
src/protean_flask/core/views.py	86.82% <100%> (-0.11%)	⬇️
src/protean_flask/core/base.py	83.67% <75%> (+1.85%)	⬆️
src/protean_flask/__main__.py

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