update uppy-server version

package.json

@@ -69,7 +69,7 @@
     "sass": "0.5.0",
     "tap-spec": "4.1.1",
     "tape": "4.6.3",
-    "uppy-server": "0.0.7",
+    "uppy-server": "0.4.0",
     "watchify": "3.7.0"
   },
   "dependencies": {