Add to --boorus cli sample

[basisbit]

Added more commonly used philomena boorus to the --boorus cli example in the README.md.

[Sibusten]

This command is specifically referencing the example from the gif, which used derpibooru and ponybooru as an example of multiple booru downloading. Adding more booru names here would make it inconsistent.

Maybe a list of known Philomena sites somewhere else would be appropriate, perhaps as a wiki page?

[Sibusten]

I can enable Wikis for the repo if you would like to help fill it out. And thank you for the contribution!

[CloudSnowPony]

Hi! My bot stopped working. I live in a country where this site is blocked and I have to use different methods to bypass the provider's blocking. And everything worked perfectly. And now the bot just shows the time endlessly, nothing helps. The old methods allow you to bypass the blocking of the PC itself, but the bot simply refuses to work! Please help me!