add straightforward example for a single episode

i had to look into the usage and puzzle a bit before figuring that one out. i tried all of those without success:

```
$ toutv fetch 2425154539
Cannot find "2425154539"
Did you mean one of the following?

  * 2424965939
  * 2424965839
  * 2421265159
anarcat@marcos:tv$ toutv fetch "S2014E11 La guerre des bois"
Cannot find "S2014E11 La guerre des bois"
Did you mean one of the following?

  * LA GUERRE DES ROBOTS
  * LA GUERRE DES OPOSSUMS
anarcat@marcos:tv$ toutv fetch Enquete 2425154539
Cannot find "Enquete"
Did you mean one of the following?

  * ENQUÊTE
  * BURQUETTE
anarcat@marcos:tv$ toutv fetch Enquete S2014E11
Cannot find "Enquete"
Did you mean one of the following?

  * ENQUÊTE
  * BURQUETTE
```

It would have been helpful to have this documentation in the README to help me out...