Avoid quitting in interractive mode

[p1gp1g]

Description

When I use interactive mode, I often ends by closing ffuf by mistake. This PR avoid this issue : if you want to close ffuf while in interactive mode, you have to write "quit" (like many other interactive tools)

Additonally

• If this is the first time you are contributing to ffuf, add your name to CONTRIBUTORS.md. Delete multiple queues with a single cmd #727
  The file should be alphabetically ordered.
• Add a short description of the fix to CHANGELOG.md

Thanks for contributing to ffuf :)