[3.5] fixed type annotation in method add_view in UrlDispatcher (#3880)

[asvetlov]

(cherry picked from commit 049101b)

Co-authored-by: Ilya Chichak ilyachch@gmail.com

[codecov-io]

Codecov Report

Merging #3887 into 3.5 will increase coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.5    #3887      +/-   ##
==========================================
+ Coverage   97.86%   98.12%   +0.25%     
==========================================
  Files          44       44              
  Lines        8579     9043     +464     
  Branches     1380     1538     +158     
==========================================
+ Hits         8396     8873     +477     
+ Misses         78       69       -9     
+ Partials      105      101       -4

Impacted Files	Coverage Δ
aiohttp/__init__.py	100% <0%> (ø)	⬆️
aiohttp/streams.py	98.2% <0%> (+0.26%)	⬆️
aiohttp/web.py	99.39% <0%> (+0.29%)	⬆️
aiohttp/helpers.py	96.74% <0%> (+0.5%)	⬆️
aiohttp/pytest_plugin.py	98% <0%> (+0.73%)	⬆️
aiohttp/web_runner.py	98.87% <0%> (+0.94%)	⬆️
aiohttp/connector.py	99.08% <0%> (+1.41%)	⬆️
aiohttp/tcp_helpers.py	93.33% <0%> (+3.33%)	⬆️
aiohttp/locks.py	100% <0%> (+7.14%)	⬆️

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