Update notes.

mini_al.h

 // Audio playback and capture library. Public domain. See "unlicense" statement at the end of this file.
-// mini_al - v0.8.5 - 2018-08-12
+// mini_al - v0.8.6-rc - 2018-xx-xx
 //
 // David Reid - davidreidsoftware@gmail.com
 
@@ -27454,6 +27454,12 @@ mal_uint64 mal_sine_wave_read_ex(mal_sine_wave* pSineWave, mal_uint64 frameCount
 // REVISION HISTORY
 // ================
 //
+// v0.8.6-rc - 2018-xx-xx
+//   - Automatically switch the internal device when the default device is unplugged. Note that this is still in the
+//     early stages and not all backends handle this the same way. As of this version, this will not detect a default
+//     device switch when changed from the operating system's audio preferences (unless the backend itself handles
+//     this automatically).
+//
 // v0.8.5 - 2018-08-12
 //   - Add support for specifying the size of a device's buffer in milliseconds. You can still set the buffer size in
 //     frames if that suits you. When bufferSizeInFrames is 0, bufferSizeInMilliseconds will be used. If both are non-0