Add a limitTags when in isMulti mode

[amarabamba]

Hello,

I suggest adding a prop named limitTags when using the isMulti prop, in order to avoid a negative impact on the user interface when there are a large number of selected items.

eg:

<Select
  {...rest}
  limitTags={3}
 />

When more than 3 items are selected, the first 3 items are displayed and the remaining number of items is counted as n-others.