Update README.md

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@@ -81,6 +81,9 @@ A callback that is fired every time an item is selected. It receives an object i
     
     {label: <label>, value: <value>}
 
+**showValue**:  
+If set to true, will display the value of the entry after the label in the dropdown list.
+
 **treshold**:  
 The number of characters that need to be typed on the input in order to trigger the autocomplete. Default is 4.