fix rules_webtesting
diff --git a/buildkite/pipelines/rules_webtesting-postsubmit.json b/buildkite/pipelines/rules_webtesting-postsubmit.json
index 6a514aa..d976383 100644
--- a/buildkite/pipelines/rules_webtesting-postsubmit.json
+++ b/buildkite/pipelines/rules_webtesting-postsubmit.json
@@ -8,6 +8,6 @@
     },
     "macos": {
       "test_targets": ["-- //... -//go/launcher/webdriver:go_default_test_chrome55-win10"]
-    },
+    }
   }
 }