Update README.md

Author: mynameiskenlee

README.md

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 # flutter_macos_menubar_example
 
 starter template for building menubar app in flutter
-![Demo](Demo.png | width=25%)
+
+<img src="https://github.com/mynameiskenlee/flutter_macos_menubar_example/blob/master/Demo.png?raw=true" width="250" />
 
 Use [multi_windows](https://github.com/mynameiskenlee/flutter_macos_menubar_example/tree/multi_windows) branch for example with addtional windows
+
 ![multi_windows demo](multi_window.gif)
 
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