I wouldn’t do it, it’s spammy. Plus I believe if you mail too many people in a certain time frame (I don’t know what that is), Fiverr will lock down your inbox to investigate or something. So, bad idea, all in all, since you won’t be able to respond to regular requests and your treasured response rate will sink like a stone.
Just mention it in your gig and in the normal course of communications. Think about it this way: if I sent you an email telling you that I had upgraded my writing tools, would you really care? I realize this makes a much bigger difference in a studio with regard to the quality of your offerings, but still–it’s not something you need to bother people about who aren’t already actively considering you for whatever project they have going on. That’s why it’s spammy.