Add note about ValidationFailure to ValidationError in changes.md

Author: tswfi

CHANGES.md

@@ -5,6 +5,7 @@
 ### What's Changed
 
 - feat: refactoring; updates; fixes; bump version by @joe733 in [#283](https://github.com/python-validators/validators/pull/283)
+  * BC break: ValidationFailure renamed to ValidationError,
 - build(deps): bump pymdown-extensions from 9.11 to 10.0 by @dependabot in [#273](https://github.com/python-validators/validators/pull/273)
 - build(deps): bump requests from 2.28.2 to 2.31.0 by @dependabot in [#275](https://github.com/python-validators/validators/pull/275)
 - add validator ETH addresses (ERC20) by @msamsami in [#276](https://github.com/python-validators/validators/pull/276)