Update readme.

Author: devinroth

README.md

@@ -23,7 +23,7 @@ Sponsor: https://github.com/sponsors/ExistentialAudio
 - [Wiki](https://github.com/ExistentialAudio/BlackHole/wiki)
 
 ## Features
-- Supports 2 or 16 audio channels versions.
+- Supports 2, 16 or 64 audio channels versions.
 - Customizable to 256+ audio channels.
 - Supports 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz sample rates.
 - No driver latency.