Strangely enough, according to this Avast thinks it is ok. But this is actually the 3rd report I've gotten from Avast about the update.
This isn't uncommon, it feels like every update we go through the same thing, many users report false positives from their antiviruses. I think the antiviruses are just unsure what this brand new file is, they might be especially confused that a new library (libcurl) was added.
Just ignore the warning if you can. It is definitely not a virus.