Changed Y/n to y/n

[Wobak]

Hello,

First : thank you for this amazing script, I love that I don't have to change manually 20 episodes of something.

This is a small request that is not really a "bug", but more an improvement :)

When running a linux script, it is the convention that if you have a choice [Y/n], that the letter in uppercase is the default choice if you press enter.

If you need the choice to be made by the user, then [y/n] is the appropriate way to put it.

I modified it in the main python script, so that it correctly reflects that.