Add ChangeLog

Author: sebastianbergmann

ChangeLog.md

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+# ChangeLog
+
+All notable changes are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [2.0.0] - 2017-07-11
+
+### 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
+
+[2.0.0]: https://github.com/sebastianbergmann/diff/compare/1.4...2.0.0