Changelog for #126

Author: sampsyo

README.rst

@@ -73,6 +73,7 @@ Version History
   Drop support for Python 2 and older versions of Python 3. The library now
   requires Python 3.6+.
   Increase default block size in FFmpegAudioFile to get slightly faster file reading.
+  Cache backends for faster lookup (thanks to @bmcfee).
 
 2.1.9
   Work correctly with GStreamer 1.18 and later (thanks to @ssssam).