sentry-sdk is all the new rage (instead of python-raven)

[peterbe]

"This SDK is being phased out for Sentry-Python."

The new library is called sentry-sdk and I admit that I don't know what the heck the functional difference is. But with this being a thing I suspect Sentry will put more effort into sentry-sdk instead of python-raven. So it might be worth for us to upgrade.