update changelog
add changelog entry for lastgenre: allow `prefer_specific` without
`canonical`.
@@ -26,6 +26,9 @@ Fixes:
* Display the artist credit when matching albums if the :ref:`artist_credit`
configuration option is set.
:bug:`2953`
+* LastGenre: Allow to set the configuration option ``prefer_specific``
+ without setting ``canonical``.
+ :bug:`2973`
1.4.7 (May 29, 2018)
