0.6.0

- Simplify drawing the notification bubble
- Switch to new fallback style class "keycap"
- Ensure normal font size with Adwaita and keycap class
- Fix logging simultaneous notifications (Bug #15167)
- Disable rounded corners w/o compositing (Bug #16586)
- panel-plugin: Fix configure dialog
- panel-plugin: Use new XfceTitledDialog api
- panel-plugin: Toggle 'Do not disturb' with middle mouse click (Bug
  #16132)
- Allow compilation with panel 4.15
- panel-plugin: Remove deprecated calls
- Replace GtkStock buttons
- Translation Updates:
  Albanian, Arabic, Armenian (Armenia), Belarusian, Chinese (China),
  Chinese (Taiwan), Croatian, Danish, Finnish, Galician, Georgian,
  German, Greek, Icelandic, Indonesian, Italian, Norwegian Bokmål,
  Portuguese, Portuguese (Brazil), Serbian, Slovak, Slovenian, Spanish,
  Turkish, Ukrainian
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