KDE Plasma Desktop -- update to 5.16.5

Tuesday, 3 September 2019. Today KDE releases a Bugfix update to KDE Plasma 5,
versioned 5.16.5. Plasma 5.16 was released in June with many feature
refinements and new modules to complete the desktop experience.

This release adds a month's worth of new translations and fixes from KDE's
contributors. The bugfixes are typically small but important and include:

• [weather] [envcan] Add additional current condition icon mappings.
• [Notifications] Group only same origin and show it in heading.
• Volume Control: Fix speaker test not showing sinks/buttons.

Full changelog:
https://kde.org/announcements/plasma-5.16.4-5.16.5-changelog.php