Fix aiohttp deprecation warning and log level #28
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In current version aiohttp throws DeprecationWarning because we don't use asynchronous context managers for sessions.
As we use python 3.5, I think it's ok to use them.
And also I fixed logging levels for some errors. I think it's a common error when proxy broker receives 500 HTTP code from proxy list site, because it is broken. But it is not an error of proxybroker and we should not log it with error level. I made logging these errors with lower level.
For now with these fixes, when we execute simple script from example folder we don't see any errors and get correct result.
What do you think about it, @constverum ?