mention rebooting (#648)

in my experience it tends to not work before a restart

Author: cobalt2727

README.md

@@ -24,6 +24,7 @@ Go to the [Releases tab](https://github.com/Davidobot/BetterJoy/releases/)!
 1. Install drivers
     1. Read the READMEs (they're there for a reason!)
     1. Run *Drivers/ViGEmBus_Setup_1.16.116.exe*
+    1. Restart your computer
 2. Run *BetterJoyForCemu.exe* 
     1. Run as Administrator if your keyboard/mouse button mappings don't work
 3. Connect your controllers.