Libravatar support possible?

Hello,

first of all: I love your plugin. Thanks for making it.

I want to ask if there is any chance to get the same functionality for Libravatar – which works basically the same as Gravatar but with better hashing of the email. It uses the same URL structure as Gravatar for avatars and the same lookup mechanisms (as far as I can see)

I would love to use these avatars as well with your plugin. At the moment I van either use your plugin and gravatar OR Libravatar and get no caching at all.

Thanks for considering,

all the best,

Jascha