Fixed saving token

frontend/src/auth/index.js

@@ -17,6 +17,7 @@ export default {
     })
       .then(response => {
         // Save the token to local storage for later use
+        localStorage.removeItem('token') // Delete an eventually preexisting old token
         localStorage.setItem('token', response.data.token)
 
         // Tell others the user is autheticated