use trafaret.IP instead

[thijstriemstra]

Trafaret provides an IP type.

[thijstriemstra]

And without this change the demo breaks with Trafaret >= 0.11

[asvetlov]

Thanks!
I very appreciate PRs for aiohttp demos.
Unfortunately demos are not test covered by their nature. Test suite need Postgres and manual steps for adding pg user, etc. and etc.
Thus the baby lives without parent control and it is outdated very often.

[asvetlov]

If you want to polish http://aiohttp.readthedocs.io/en/stable/tutorial.html -- you are welcome

[codecov-io]

Codecov Report

Merging #2187 into master will decrease coverage by 0.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2187      +/-   ##
==========================================
- Coverage   97.15%   96.68%   -0.47%     
==========================================
  Files          39       39              
  Lines        7895     7895              
  Branches     1367     1367              
==========================================
- Hits         7670     7633      -37     
- Misses        100      113      +13     
- Partials      125      149      +24

Impacted Files	Coverage Δ
aiohttp/helpers.py	93.98% <0%> (-3.35%)	⬇️
tests/autobahn/client.py	94.65% <0%> (-2.21%)	⬇️
aiohttp/streams.py	98% <0%> (-0.75%)	⬇️
aiohttp/test_utils.py	97.92% <0%> (-0.7%)	⬇️
aiohttp/multipart.py	94.9% <0%> (-0.55%)	⬇️
examples/client_ws.py	95.81% <0%> (-0.53%)	⬇️
aiohttp/web_response.py	98.19% <0%> (-0.52%)	⬇️
examples/web_ws.py	94.77% <0%> (-0.41%)	⬇️
aiohttp/client_reqrep.py	96.98% <0%> (-0.22%)	⬇️
aiohttp/connector.py	97.44% <0%> (-0.22%)	⬇️
... and 1 more

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