remove discord link

Author: brian-armstrong

README.md

@@ -1,8 +1,6 @@
 QuietModemKit
 ==============
 
-[![Quiet Modem Chat](https://discordapp.com/api/guilds/290985648054206464/embed.png?style=shield)](https://discordapp.com/invite/eRw5UjF)
-
 This is the iOS framework for https://github.com/quiet/quiet
 
 With this library, you can send data through sound.