Update the changelog

Author: ignisf

CHANGELOG.md

@@ -1,9 +1,11 @@
-### v5.9.211.38.0beta1 - Unreleased
+### v6.0.286.54.0 - Unreleased
 
-* Update upstream v8 version to 6.0.286.44
+* Update upstream v8 version to 6.0.286.54
 * V8 source is no longer pulled using the fetch command from depot_tools but is
   instead added as a submodule in the current tree
 * Hooks are no longer ran after syncing V8's upstream dependencies
+* Reordered libraries in accordance with the V8 wiki
+* Added groups around the library flags in accordance with the V8 wiki
 
 ### v5.9.211.38.0, v5.9.211.38.1 - 2017-07-26