create onVote event, similar to onComment, onPost...

[OyvindSabo]

It would be nice to have an a bot.onVote event, to make it easy to replicate the upvotes of someone else. This would be convenient for those who prefer to store their STEEM on another account for safety, but who still want their voting power to serve those they choose to upvote from their main account.

[p0o]

Hmm, I'm now wondering how we don't have it. It's quite easy to wrap it around the existing API. Will put it in priority for the next update.