Add changelog note

OpenZeppelin · Jan 8, 2022 · b34920b · b34920b
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -13,6 +13,7 @@
  * `ERC2771Context`: use immutable storage to store the forwarder address, no longer an issue since Solidity >=0.8.8 allows reading immutable variables in the constructor. ([#2917](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2917))
  * `Base64`: add a library to parse bytes into base64 strings using `encode(bytes memory)` function, and provide examples to show how to use to build URL-safe `tokenURIs` ([#2884](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2884))
  * `ERC20`: reduce allowance before triggering transfer.
+ * `ERC20`: do not change ERC20 allowance on `transferFrom` when allowance is `type(uint256).max`.
 
 ## 4.4.1 (2021-12-14)