Update ChangeLog

Author: sebastianbergmann

ChangeLog.md

@@ -2,6 +2,12 @@
 
 All notable changes are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## [9.2.7] - 2021-MM-DD
+
+### Fixed
+
+* [#860](https://github.com/sebastianbergmann/php-code-coverage/pull/860): Empty value for `XDEBUG_MODE` environment variable is not handled correctly
+
 ## [9.2.6] - 2021-03-28
 
 ### Fixed
@@ -324,6 +330,7 @@ All notable changes are documented in this file using the [Keep a CHANGELOG](htt
 * Class names are now abbreviated (unqualified name shown, fully qualified name shown on hover) in the file view of the HTML report
 * Update HTML report to Bootstrap 4
 
+[9.2.7]: https://github.com/sebastianbergmann/php-code-coverage/compare/9.2.6...9.2
 [9.2.6]: https://github.com/sebastianbergmann/php-code-coverage/compare/9.2.5...9.2.6
 [9.2.5]: https://github.com/sebastianbergmann/php-code-coverage/compare/9.2.4...9.2.5
 [9.2.4]: https://github.com/sebastianbergmann/php-code-coverage/compare/9.2.3...9.2.4