Swagger schema partial patching. Swagger schema validation.

[trezorg]

It would be useful to redefine or update global swagger schema by endpoint swagger definition.
Also it is possible to validate swagger schema. Also dropped 3.4 support.

[codecov-io]

Codecov Report

Merging #43 into master will increase coverage by 2.31%.
The diff coverage is 95.92%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   92.98%   95.29%   +2.31%     
==========================================
  Files           4        5       +1     
  Lines         114      319     +205     
==========================================
+ Hits          106      304     +198     
- Misses          8       15       +7

Impacted Files	Coverage Δ
aiohttp_swagger/helpers/__init__.py	100% <100%> (ø)	⬆️
aiohttp_swagger/helpers/decorators.py	100% <100%> (ø)	⬆️
aiohttp_swagger/__init__.py	100% <100%> (+2.63%)	⬆️
aiohttp_swagger/helpers/validation.py	94.87% <94.87%> (ø)
aiohttp_swagger/helpers/builders.py	92.47% <97.22%> (+2.76%)	⬆️

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[CyberLight]

@trezorg Thank you! I used the code from your PR, and it saved my time!
May be some changes need:

• Draft4Validator to Draft7Validator
• if issubclass(handler, web.View) and route.method == METH_ANY: to if inspect.isclass(handler) and issubclass(handler, web.View) and route.method == METH_ANY:

P.S.: Very cool PR, but I don’t understand why this PR hasn't been accepted until now