New preview gif for Ombi V3 README (#1767)

The proges of the gif:
1. Landing Page
2. Login
3. Search and Request 
3.a Movie - Avatar showing both request and the available function (Link to Plex)
3.b Series - Star Trek showing the different request options - all, first and last season
3. Show Requests for both movie and series

README.md

@@ -86,7 +86,7 @@ Search the existing requests to see if your suggestion has already been submitte
 
 # Preview
 
-![Preview](http://i.imgur.com/yrz2pzl.gif)
+![Preview](http://i.imgur.com/rTBEt6K.gif)
 
 # Installation