React 12 - Lifting State Up - Challenge

As usual, you'll find all the components under the src folder:

• App: "root" component (other "dummy" components are provided)
• TabSelector: allows to select a tab

You have to modify the components, so that:

• the activeId is present only in App component's state,
• it is passed to TabSelector,
• the method allowing to change activeId is in the right place