Don't reset log caching

uvicorn will "load from dict" the config - which flushes the logs
and therefore cleans log-buffering

freqtrade/rpc/api_server/webserver.py

@@ -115,14 +115,12 @@ class ApiServer(RPCHandler):
 
         logger.info('Starting Local Rest Server.')
         verbosity = self._config['api_server'].get('verbosity', 'error')
-        log_config = uvicorn.config.LOGGING_CONFIG
-        # Change logging of access logs to stderr
-        log_config["handlers"]["access"]["stream"] = log_config["handlers"]["default"]["stream"]
+
         uvconfig = uvicorn.Config(self.app,
                                   port=rest_port,
                                   host=rest_ip,
                                   use_colors=False,
-                                  log_config=log_config,
+                                  log_config=None,
                                   access_log=True if verbosity != 'error' else False,
                                   )
         try: