You should not use <Link> outside a <Router>

[eligao]

What you were expecting:
Proper rendering

What happened instead:

Invariant Violation
You should not use <Link> outside a <Router>

Steps to reproduce:
Follow the official tutorial till this section:
https://marmelab.com/react-admin/Tutorial.html#mapping-api-endpoints-with-resources
This also happens when I upgrade my old project to new react-admin (currently 2.8.2)

Related code:

• CodeSandbox (https://codesandbox.io/s/14nl4pw6k4)

Other information:

Environment

• React-admin version: 2.8.2
• Last version that did not exhibit the issue (if applicable): previously I was using 2.2.0
• React version: 16.4.2, 16.8.4
• Browser: Chrome 73.0.3683.75
• Stack trace (in case of a JS error):

Invariant Violation
You should not use <Link> outside a <Router>
▶ 21 stack frames were collapsed.
evaluate
/src/index.js:9:9
   6 | import App from "./App";
   7 | 
   8 | const rootElement = document.getElementById("root");
>  9 | ReactDOM.render(<App />, rootElement);
     |         ^
  10 | 
View compiled
▶ 10 stack frames were collapsed.

[eligao]

looks like a dup of #3018