Move support channel from freenode to oftc in README.md.

Author: unixabg

README.md

@@ -6,7 +6,7 @@ Assists in the full setup of [encrypted] Raspberry Pis. Able to maintain multipl
 - Host OS: Debian 10 and Kali
 - Target OS: Kali,Pi OS, and Ubuntu
 - Target Hardware: RaspberryPi 2, 3, and 4
-- irc channel freenode/#cryptmypi
+- irc channel oftc/#cryptmypi
 
 ## How it works