fix class based view

[zhenhua32]

[codecov-io]

Codecov Report

Merging #59 into master will increase coverage by 0.52%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   88.61%   89.14%   +0.52%     
==========================================
  Files           4        4              
  Lines         123      129       +6     
==========================================
+ Hits          109      115       +6     
  Misses         14       14

Impacted Files	Coverage Δ
aiohttp_swagger/helpers/builders.py	83.33% <100%> (+0.21%)	:arrow_up:
aiohttp_swagger/__init__.py	97.67% <100%> (+0.3%)	:arrow_up:

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