Update Readme

README.md

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 # super_tooltip
 [![Static code analysis](https://github.com/bensonarafat/super_tooltip/actions/workflows/dart.yml/badge.svg)](https://github.com/bensonarafat/super_tooltip/actions/workflows/dart.yml)
+[![pub package](https://img.shields.io/pub/v/super_tooltip.svg)](https://pub.dartlang.org/packages/super_tooltip) 
 
 
 `SuperTooltip` It is super flexible and allows you to display ToolTips in the overlay of the screen. It gives you more flexibility over the Flutter standard ```Tooltip```. You have the option to make the whole screen covered with a background color. Tapping on the background closes the Tooltip.