v0.6.0

• The default themes and config files are now embedded into the vivid binary.
  See #43 (@LordFlashmeow)
• Added XDG_CONFIG_HOME as a possible source for theme files, see #40 (@LordFlashmeow)
• Better error handling, see #43 (@LordFlashmeow)
• Added macOS category to unimportant files, see #33 (@gseidler)
• Added more media file types, see #38 (@gseidler)
• Add new core filetypes for sticky/other_writable/sticky_other_writable, see #34 (@mattbalvin)