docs: Update README.md (#20)

Removed the outdated install instructions and replaced them with instructions to use the `.MidiMixerPlugin` file

Author: Jaggernaut555

Diff for: README.md

@@ -5,7 +5,7 @@ Currently this is a proof-of-concept plugin to show some practical usage of [mid
 ## Usage
 
 1. Download and install [obs-websocket](https://obsproject.com/forum/resources/obs-websocket-remote-control-obs-studio-from-websockets.466/) for OBS
-2. [Download the plugin](https://github.com/midi-mixer/plugin-obs/archive/main.zip)
-3. Extract the `plugin-obs-main` folder to `%appdata%/midi-mixer-app/plugins`
+2. [Download the plugin](https://github.com/midi-mixer/plugin-obs/releases/latest)
+3. Open the `.MidiMixerPlugin` file with midi mixer
 
 For more information on how this plugin was made (or to make your own) check out [midi-mixer-plugin](https://github.com/midi-mixer/midi-mixer-plugin) and the [midi-mixer/plugin-template](https://github.com/midi-mixer/plugin-template) repository.