Fixed a typo (#654)

Just a simple typo fix.

README.md

@@ -15,7 +15,7 @@
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 **Jellyseerr** is a free and open source software application for managing requests for your media library.
-It is a a fork of [Overseerr](https://github.com/sct/overseerr) built to bring support for [Jellyfin](https://github.com/jellyfin/jellyfin) & [Emby](https://github.com/MediaBrowser/Emby) media servers!
+It is a fork of [Overseerr](https://github.com/sct/overseerr) built to bring support for [Jellyfin](https://github.com/jellyfin/jellyfin) & [Emby](https://github.com/MediaBrowser/Emby) media servers!
 
 _The original Overseerr team have been busy and Jellyfin/Emby support aren't on their roadmap, so we started this project as we wanted to bring the Overseerr experience to the Jellyfin/Emby Community!_