Log Message:
py-tzlocal: updated to 1.5.1

1.5.1:
- 1.5 had a bug that slipped through testing, fixed that,
increased test coverage.

1.5:
- No longer treats macOS as special, but as a unix.
- get_windows_info.py is renamed to update_windows_mappings.py
- Windows mappings now also contain mappings from deprecated zoneinfo names.
(Preston-Landers, regebro)