Update changelog

Author: mvantellingen

CHANGES

@@ -1,3 +1,11 @@
+4.1.0 (2021-08-15)
+------------------
+ - Remove last dependency on `six` (#1250)
+ - Use `platformdirs` instead of the `appsdirs` dependency (#1244)
+ - Fix settings context manager when an exception is raised (#1193)
+ - Don't render decimals using scientific notation (#1191)
+ - Remove dependency on `defusedxml` (deprecated) (#1179)
+
 4.0.0 (2020-10-12)
 ------------------
  - Drop support for Python 2.7, 3.3, 3.4 and 3.5