Update ChangeLog.md

Author: SpacePossum

ChangeLog.md

@@ -1,22 +1,7 @@
 # ChangeLog
 
-All notable changes are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+Changelog for v1.0
 
-## [2.0.1] - 2017-08-03
-
-### Fixed
-
-* Fixed [#66](https://github.com/sebastianbergmann/diff/pull/66): Restored backwards compatibility for PHPUnit 6.1.4, 6.2.0, 6.2.1, 6.2.2, and 6.2.3
-
-## [2.0.0] - 2017-07-11 [YANKED]
-
-### Added
-
-* Implemented [#64](https://github.com/sebastianbergmann/diff/pull/64): Show line numbers for chunks of a diff
-
-### Removed
-
-* This component is no longer supported on PHP 5.6
-
-[2.0.1]: https://github.com/sebastianbergmann/diff/compare/c341c98ce083db77f896a0aa64f5ee7652915970...2.0.1
-[2.0.0]: https://github.com/sebastianbergmann/diff/compare/1.4...c341c98ce083db77f896a0aa64f5ee7652915970
+First stable release, based on:
+https://github.com/sebastianbergmann/diff/releases
+1.4.3 and 2.0.1