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.  

if not response._content_consumed and response.raw:
                    response._content = response.raw.read()
            
            if self.proxy.update_listener:
                kwargs = {
                    'method': method,
                    'path': path,
                    'data': data,
                    'headers': forward_headers,
                    'response': response
                }
                if 'request_handler' in inspect.getargspec(self.proxy.update_listener.return_response)[0]:
                    
                    
                    kwargs['request_handler'] = self
                updated_response = self.proxy.update_listener.return_response(**kwargs)
                if isinstance(updated_response, Response):
                    response = updated_response
            
            self.send_response(response.status_code)
            content_length_sent = False
            for header_key, header_value in iteritems(response.headers):
                
                if header_key.lower() not in ('transfer-encoding', 'date', 'server'):
                    self.send_header(header_key, header_value)
                    content_length_sent = content_length_sent or header_key.lower() == 'content-length'
            if not content_length_sent:
                self.send_header('Content-Length', '%s' % len(response.content) if response.content else 0)
            
            if 'Access-Control-Allow-Origin' not in response.headers: