v2.0.0 is missing in release notes

[ulope]

What was wrong?

There is no mention of v2.0.0 (and if there are any incompatibilities) in the release notes.

[carver]

AFAIK the only "incompatibility" is that mypy wasn't actually enforcing any of the types because we were missing this line:

eth-typing/setup.py

Line 56 in 2616b92

package_data={'eth_typing': ['py.typed']},

So making upgrading to v2 might cause mypy to start erroring out. We have been able to upgrade to eth-typing v2 in most modules without any impact, though.

Naturally, 👍 for adding a note about this to the docs.

[cburgdorf]

I added the missing release notes. I also created an issue to upgrade this repo to use towncrier #16