Added 4.0.3 changelog

Author: Damian Mooyman

docs/en/04_Changelogs/4.0.3.md

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+# 4.0.3
+
+<!--- Changes below this line will be automatically regenerated -->
+
+## Change Log
+
+### Features and Enhancements
+
+ * 2018-02-01 [58840bf](https://github.com/silverstripe/silverstripe-admin/commit/58840bfba5fb5398d695b2668828ad25dabf9d2a) Capture changes on keyup with debounce (Damian Mooyman)
+ * 2017-11-06 [8dfa9a0](https://github.com/silverstripe/silverstripe-admin/commit/8dfa9a0f4b877d30a89c44a66809e934917409e8) debounce change events in changetracker - to reduce change event load build up with every keystroke (Christopher Joe)
+
+### Bugfixes
+
+ * 2018-02-04 [288aaf083](https://github.com/silverstripe/silverstripe-framework/commit/288aaf083ceff944402b2877880130a54bd04a95) Fix issue with DebugView failing on class name of existing class (Damian Mooyman)
+ * 2018-02-01 [740c3326e](https://github.com/silverstripe/silverstripe-framework/commit/740c3326e9da7cb902778f46e209319e6dfd67a7) Fix critical issue with incorrectly saved session data (Damian Mooyman)
+ * 2018-02-01 [1251f62](https://github.com/silverstripe/silverstripe-asset-admin/commit/1251f62ed484045700b057890e35d8b9ad7c5bdc) Fix issue with non-asset-admin users encountering errors embedding files (Damian Mooyman)
+ * 2018-02-01 [b05a306](https://github.com/silverstripe/silverstripe-assets/commit/b05a306981f34181983863c4c5dd904b9ec347b3) Ensure CMS authors can all see draft files by default (Damian Mooyman)
+ * 2018-01-30 [cd6faac7a](https://github.com/silverstripe/silverstripe-framework/commit/cd6faac7a9cf1ea95893c14900cdd5ade0e256dc) Fix typo in error message (Raissa North)
+ * 2018-01-30 [0d9e20d](https://github.com/silverstripe/silverstripe-asset-admin/commit/0d9e20d1a561c4f5f8afcf9057acbddb3a90bdac) entwine+react in case they rely on the redux store (Christopher Joe)
+ * 2018-01-29 [771e938](https://github.com/silverstripe/silverstripe-admin/commit/771e938374832d2831da53f030e8263b7983a35f) TreeMultiselectField in Entwine sections (Christopher Joe)
+ * 2018-01-29 [3d7ecc524](https://github.com/silverstripe/silverstripe-framework/commit/3d7ecc524000aa0173d03c06e96d7c60a9505b5e) Allow cleanup marker regex to handle self closing HTML5 tags (Robbie Averill)
+ * 2018-01-29 [df71756](https://github.com/silverstripe/silverstripe-asset-admin/commit/df717562afc4d01ecac251d4d7b2e391c9e3e4cc) remove uploaded items when executing or removing search (#726) (Chris Joe)
+ * 2018-01-26 [8a31db5](https://github.com/silverstripe/silverstripe-errorpage/commit/8a31db5183fd28ac3eefb88bbe9ab25b414736d0) 'Error code' dropdown was misplaced (Loz Calver)