message: Remove unused lambda capture in chain_api_plugin
  warning b-gone
diff: @@ -50,7 +50,7 @@ struct async_result_visitor : public fc::visitor<std::string> {
  #define CALL_ASYNC(api_name, api_handle, api_namespace, call_name, call_result, http_response_code) \
  {std::string("/v1/" #api_name "/" #call_name), \
  - [this, api_handle](string, string body, url_response_callback cb) mutable { \
  + [api_handle](string, string body, url_response_callback cb) mutable { \
  if (body.empty()) body = "{}"; \
  api_handle.validate(); \
  api_handle.call_name(fc::json::from_string(body).as<api_namespace::call_name ## _params>(),\
  