Relax React dep requirements

Author: gaearon

packages/react-error-overlay/package.json

@@ -35,8 +35,8 @@
     "babel-code-frame": "6.22.0",
     "babel-runtime": "6.26.0",
     "html-entities": "1.2.1",
-    "react": "^15.5.4",
-    "react-dom": "^15.5.4",
+    "react": "^15 || ^16",
+    "react-dom": "^15 || ^16",
     "settle-promise": "1.0.0",
     "source-map": "0.5.6"
   },