Add pre-release badge to readme

README.md

@@ -2,6 +2,7 @@
 
 [![](https://img.shields.io/github/license/erengy/taiga)](https://github.com/erengy/taiga/blob/master/LICENSE)
 [![](https://img.shields.io/github/v/release/erengy/taiga)](https://taiga.moe/download.php)
+[![](https://img.shields.io/github/v/release/erengy/taiga?color=blue&include_prereleases)](https://github.com/erengy/taiga/releases)
 [![](https://img.shields.io/discord/423475967051169813?logo=discord)](https://discord.gg/yeGNktZ)
 
 Taiga is an open-source desktop application for Windows. It automatically detects the anime videos you watch on your computer and synchronizes your progress with [AniList](https://anilist.co), [Kitsu](https://kitsu.io) or [MyAnimeList](https://myanimelist.net). It helps you manage your anime library, discover new series, share watched episodes and download new ones.