Make quorum behavior match GovernorBravo (#2974)

* Make quorum inclusive minimum in GovernorCompatibilityBravo

* add PR link

(cherry picked from commit a94cf0509f)

CHANGELOG.md

@@ -9,6 +9,7 @@
  * `EIP712`: cache `address(this)` to immutable storage to avoid potential issues if a vanilla contract is used in a delegatecall context. ([#2852](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2852))
  * Add internal `_setApprovalForAll` to `ERC721` and `ERC1155`. ([#2834](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2834))
  * `Governor`: shift vote start and end by one block to better match Compound's GovernorBravo and prevent voting at the Governor level if the voting snapshot is not ready. ([#2892](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2892))
+ * `GovernorCompatibilityBravo`: consider quorum an inclusive rather than exclusive minimum to match Compound's GovernorBravo. ([#2974](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2974))
  * `GovernorSettings`: a new governor module that manages voting settings updatable through governance actions. ([#2904](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2904))
  * `PaymentSplitter`: now supports ERC20 assets in addition to Ether. ([#2858](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2858))
  * `ECDSA`: add a variant of `toEthSignedMessageHash` for arbitrary length message hashing. ([#2865](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2865))

contracts/governance/compatibility/GovernorCompatibilityBravo.sol

@@ -247,7 +247,7 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
      */
     function _quorumReached(uint256 proposalId) internal view virtual override returns (bool) {
         ProposalDetails storage details = _proposalDetails[proposalId];
-        return quorum(proposalSnapshot(proposalId)) < details.forVotes;
+        return quorum(proposalSnapshot(proposalId)) <= details.forVotes;
     }
 
     /**