fix polls demo run application

[ediskandarov]

I'm adding a bug fix, but there's no branch for current version of aiohttp - 1.2. Set master as a target branch.

What do these changes do?

Fixed run demo polls application:

$ python -m aiohttpdemo_polls
Traceback (most recent call last):
  File "/usr/local/Cellar/python3/3.5.2_3/Frameworks/Python.framework/Versions/3.5/lib/python3.5/runpy.py", line 184, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/Cellar/python3/3.5.2_3/Frameworks/Python.framework/Versions/3.5/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/e.iskandarov/sandbox/aiohttp/demos/polls/aiohttpdemo_polls/__main__.py", line 3, in <module>
    main()
TypeError: main() missing 1 required positional argument: 'argv'

Checklist

• [√] I think the code is well written
• [-] Unit tests for the changes exist
• [-] Documentation reflects the changes
• [√] Add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• [√] Add a new entry to CHANGES.rst

[codecov-io]

Current coverage is 98.85% (diff: 100%)

Merging #1487 into master will not change coverage

@@             master      #1487   diff @@
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  Files            30         30          
  Lines          6984       6984          
  Methods           0          0          
  Messages          0          0          
  Branches       1163       1163          
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  Hits           6904       6904          
  Misses           40         40          
  Partials         40         40          

Powered by Codecov. Last update 4eef48a...34c2d18

[asvetlov]

Cool! Thank you.

P.S.
I've created missing 1.2 branch

[lock]

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