Update changelog

CHANGELOG.rst

+Version 6.0.2  (2022-09-05)
+=====================================================
+
+* Fix yarnpkg call for non-install commands
+
+Version 6.0.1  (2020-01-03)
+=====================================================
+
+* Prefer the yarnpkg command over yarn if installed due to naming conflict
+  on Debian
+
 Version 6.0  (2019-12-07)
 =====================================================