Hi, when I use the latest version I get an error when calling a Lambda. 

I get this error:
Lambda process returned error status code: 1. Output:
awssvc           | 2019-05-10T22:23:19.822966331Z Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.29/containers/create: dial unix /var/run/docker.sock: connect: permission denied
awssvc           | 2019-05-10T22:23:19.822969899Z must specify at least one container source

I'am using the Lambda in a docker. 

You can find my setup here: https://github.com/blaart/stream-my-changes
After forcing to use the 0.9.1 version all works fine again.  

modified_request = None
            
            for listener in self.DEFAULT_LISTENERS + [self.proxy.update_listener]:
                if not listener:
                    continue
                listener_result = listener.forward_request(method=method,
                    path=path, data=data, headers=forward_headers)
                if isinstance(listener_result, Response):
                    response = listener_result
                    break
                elif isinstance(listener_result, Request):
                    modified_request = listener_result
                    data = modified_request.data
                    forward_headers = modified_request.headers
                    break
                elif listener_result is not True:
                    
                    code = listener_result if isinstance(listener_result, int) else 503
                    self.send_response(code)
                    self.end_headers()
                    return
            
            if response is None:
                if modified_request:
                    response = self.method(proxy_url, data=modified_request.data,
                        headers=modified_request.headers, stream=True)
                else:
                    response = self.method(proxy_url, data=self.data_bytes,
                        headers=forward_headers, stream=True)