reorder changelog entry for upgradeable contracts

(cherry picked from commit 91dc5604)

CHANGELOG.md

-# Changelog for Upgradeable variant
-
-## 3.2.0 (2020-11-11)
-
- * First release of Upgradeable variant, replacing Ethereum Package variant which is now deprecated.
-
 # Changelog
 
 ## 4.0.0
@@ -74,6 +68,10 @@ If you're using our implementation of ERC777 from version 3.3.0 or earlier, and
  * `TimelockController`: added a contract to augment access control schemes with a delay. ([#2354](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2354))
  * `EnumerableSet`: added `Bytes32Set`, for sets of `bytes32`. ([#2395](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2395))
 
+## Upgradeable 3.2.0 (2020-11-11)
+
+ * First release of Upgradeable variant, replacing Ethereum Package variant which is now deprecated.
+
 ## 3.2.2-solc-0.7 (2020-10-28)
  * Resolve warnings introduced by Solidity 0.7.4. ([#2396](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2396))