Will Flask Break Current Extensions?

Python 3, 5 is end of life now. We won't usually, usually we're going to try to wait for the actual official end of life for Python's but it was so much more convenient to drop it at the same time. There are a ton of deprecation warnings in all the libraries this time that you'll see if you're running tests. I do want to evolve things and refactor things or identify patterns that weren't great or that aren't needed since we're dropping Python 2.