release 4.3.28

Author: xlcnd

CHANGES.txt

@@ -100,4 +100,4 @@ v4.3.24, 2020-12-31 -- Check pypi services response.
 v4.3.25, 2021-01-26 -- Fix py27 issues and close issue #106.
 v4.3.26, 2021-04-13 -- Improved speed with isbnlib-3.10.7.
 v4.3.27, 2021-04-13 -- Fix 'deleted imports'.
-v4.3.28, 2021-04-13 -- Use isbnlib-3.10.9+ to reflect changes in external services.
+v4.3.28, 2021-11-07 -- Use isbnlib-3.10.9+ to reflect changes in external services.