Update Readme

Readme.md

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 This is a simple yet fully functional example of a video plugin for [Kodi](http://kodi.tv) mediacenter.
 Please read the comments in the plugin code for more details.
 An installable .zip can be downloaded from "[Releases](https://github.com/romanvm/plugin.video.example/releases)" tab.
+Do **not** try to install a .zip generated by GitHub.
 
 **Note**: the purpose of this example plugin is to show you how to organize and play your media content in Kodi.
 The methods of obtaining such content, for example parsing websites or working with various APIs,