Consensus Check: Upgrade Governance Contract to Governor Bravo

Upgrade Uniswap’s current governance contract from Governor Alpha to Governor Bravo to improve governance upgradability and protocol safety.

Specifically, we plan on using Compound’s Governor Bravo contract rather than Open Zeppelin's reimplementation. The reasoning for doing so can be found under the "Implementation" section of the proposal.

The contracts have been deployed to Ropsten for the community to review. Links can be found below: Governor Bravo Delegator Governor Bravo Delegate Github for contracts