Update change log as per conversation with Kat

com.unity.shadergraph/CHANGELOG.md

 - Your system locale can no longer cause incorrect commands due to full stops being converted to commas.
 - Deserialization of subgraphs now works correctly.
 - Sub graphs are now suffixed with (sub), so you can tell them apart from other nodes.
-- The preview of a node does not obstruct the selection outliner.
+- The preview of a node does not obstruct the selection outliner anymore.