Improve stat cache invalidation (ticket #150)
Changes for version 5.0.3
Fix potential data loss when using FTPS (ticket #149).
Removed tag release_5_0_2
Add XXX on list announcement and spam
Remove unused `sys` import
Added tag release4_0_0 for changeset 69af68a16d70
Remove `Python :: 2` from classifiers
Add `locally-disabled` to checks to exclude
These messages clutter the output.
Update files by running `make patch` and `make docs`