think this will fix travis

kellyrmilligan · kellyrmilligan · commit 34411a972f56 · 2017-11-30T09:49:30.000-06:00
diff --git a/packages/react-dev-utils/package.json b/packages/react-dev-utils/package.json
@@ -17,6 +17,7 @@
     "crossSpawn.js",
     "eslintFormatter.js",
     "errorOverlayMiddleware.js",
+    "serveAppMiddleware.js",
     "FileSizeReporter.js",
     "printBuildError.js",
     "formatWebpackMessages.js",
