add useragent

@@ -33,6 +33,7 @@ function errorRouter(m) {
         script: _.get(m, 'fields.script', ''),
         message: _.get(m, 'fields.message', ''),
         stack: _.get(m, 'fields.stack', ''),
+        useragent: _.get(m, 'fields.useragent', ''),
         create_time: _.get(m, 'time') ? _.get(m, 'time') / 1000000 : 0
     };
 }