release(2.11.8): update release notes and -version

Author: Jade Pennig

ui/_config.scss

@@ -9,7 +9,7 @@
 ///
 /// @type String
 /// @access private
-$app-version: '2.11.6';
+$app-version: '2.11.8';
 
 /// Debug mode (uncomment to activate)
 /// Turn on to output deprecation warnings during development