Release 5.0.1-canary.4

package.json

 {
   "name": "next",
-  "version": "5.0.1-canary.3",
+  "version": "5.0.1-canary.4",
   "description": "Minimalistic framework for server-rendered React applications",
   "main": "./dist/server/next.js",
   "license": "MIT",