Update ChangeLog

Author: sebastianbergmann

ChangeLog-7.3.md

@@ -2,6 +2,12 @@
 
 All notable changes of the PHPUnit 7.3 release series are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## [7.3.1] - 2018-MM-DD
+
+### Fixed
+
+* Fixed [#3237](https://github.com/sebastianbergmann/phpunit/issues/3237): Result caching enabled by default
+
 ## [7.3.0] - 2018-08-03
 
 ### Added
@@ -26,5 +32,6 @@ All notable changes of the PHPUnit 7.3 release series are documented in this fil
 * Fixed [#3222](https://github.com/sebastianbergmann/phpunit/pull/3222): Priority of `@covers` and `@coversNothing` is wrong
 * Fixed [#3225](https://github.com/sebastianbergmann/phpunit/issues/3225): `coverage-php` missing from `phpunit.xsd`
 
+[7.3.1]: https://github.com/sebastianbergmann/phpunit/compare/7.3.0...7.3.1
 [7.3.0]: https://github.com/sebastianbergmann/phpunit/compare/7.2...7.3.0