JsonProvider should be able to accept proxy arguments

[2efPer]

class JsonProvider(object): def init(self, rpc_addr,proxies=None): ... self.proxies=proxies ... def json_rpc(self, method, params, timeout=2): ... r = requests.post(self.rpc_addr(), json=j, timeout=timeout,proxies=self.proxies) ...

example:

proxies=

{'http':'socks5://localhost:1080','https':'socks5://localhost:1080'}

provider=JsonProvider(node_url,proxies)