change api root

package.json

@@ -25,6 +25,7 @@
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject"
   },
+  "proxy": "http://localhost:4000",
   "devDependencies": {
     "eslint-config-airbnb": "^16.1.0",
     "eslint-config-prettier": "^2.9.0",

src/actions/util.js

@@ -1,4 +1,4 @@
-export const API_ROOT = 'http://localhost:4000/api';
+export const API_ROOT = '/api';
 
 export function getToken() {
   return localStorage.getItem('jwt');