Broken proxy module

[AndreMiras]

Using the proxy module would fail with a etherscan.client.EmptyResponse.
This is because Client.connect() is expecting data.get('status') == '1' which is not the case for the proxy module.
See https://api.etherscan.io/api?module=proxy&action=eth_blockNumber&apikey=YourApiKeyToken for example returns:

{"jsonrpc":"2.0","id":83,"result":"0x56c811"}

[corpetty]

The recent pull requests #35 seems to fix this, if no one needs python 2.7 it can be merged.

[AndreMiras]

If you guys drop Python2 support, then think about updating the tox file so integration tests stay green.

[corpetty]

dropped, closed.