Update CHANGELOG.md

Author: nventuro

CHANGELOG.md

@@ -1,11 +1,15 @@
 # Changelog
 
+## 2.5.0 (unreleased)
+
+### New features:
+ * `SafeCast.toUintXX`: new library for integer downcasting, which allows for safe operation on smaller types (e.g. `uint32`) when combined with `SafeMath`. ([#1926](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1926))
+
 ## 2.4.0 (unreleased)
 
 ### New features:
  * `Address.toPayable`: added a helper to convert between address types without having to resort to low-level casting. ([#1773](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1773))
  * Facilities to make metatransaction-enabled contracts through the Gas Station Network. ([#1844](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/1844))
- * `SafeCast.toUintXX`: Increases security when used along with `SafeMath` for unitXX operations requiring downcasting. 
 
 ### Improvements:
  * `Address.isContract`: switched from `extcodesize` to `extcodehash` for less gas usage. ([#1802](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1802))