Remove irrelevant thumbnail

Author: rexim

README.md

@@ -2,8 +2,6 @@
 
 Given the [VOD](https://help.twitch.tv/s/article/video-on-demand) of the stream and the timestamps file, generate a video using [ffmpeg](https://www.ffmpeg.org/) that cuts out part of the VOD according to the provided markers.
 
-![thumbnail](./thumbnail.png)
-
 ## Quick Start
 
 Install [Go](https://golang.org/) and [ffmpeg](https://www.ffmpeg.org/).