Updated readme for two new event support.

src/extensions/editable/README.md

@@ -36,6 +36,18 @@ Fired when an editable cell is saved.
 
 parameters: field, row, oldValue, $el
 
+### onEditableShown(editable-shown.bs.table)
+
+Fired when an editable cell is opened for edits.
+
+parameters: field, row, $el
+
+### onEditableHidden(editable-hidden.bs.table)
+
+Fired when an editable cell is hidden / closed.
+
+parameters: field, row, $el
+
 ## The existing problems
 
 * Editable extension does not support searchable in the select type.