Bump pyxdg from 0.25 to 0.26

[dependabot]

Bumps pyxdg from 0.25 to 0.26.

Changelog

Sourced from pyxdg's changelog.

Version 0.26 ()
* DesktopEntry: Add a method to check the existence of the TryExec value,
Debian bug #618514.

Version 0.25 (December 2012)
* Add support for $XDG_RUNTIME_DIR, Debian bug #656338.
* Allow desktop entry files that are not encoded in UTF-8, Debian bug #693855.
* Mime: Add support for subclasses and aliases.

Version 0.24 (October 2012)
* Update allowed DesktopEntry categories following changes to the
specification.
* Fix removal of empty submenu, freedesktop bug #54747.
* Documentation is now available on RTD: http://pyxdg.readthedocs.org/
* A few more tests, and some code cleanup.
* Fix failure to parse some menu files when kde-config is missing,
freedesktop bug #56426.

Version 0.23 (July 2012)
* Fix a test for non-UTF-8 locales.

Version 0.22 (July 2012)
* Better unicode handling in several modules.
* Fix for sorting non-ASCII menu entries, freedesktop bug #52492.
* More tests.

Version 0.21 (July 2012)
* Tests can now be run conveniently using nosetests, and cover more of the
code.
* BaseDirectory: New save_cache_path() function, freedesktop bug #26458.
* Config: Default icon theme is 'hicolor', not 'highcolor'.
* Menu: Obsolete Rule.compile() method removed.
* DesktopEntry: Corrected spelling of checkCategories() method, freedesktop
bug #24974.
* DesktopEntry: Consider Actions and Keywords keys standard.
* DesktopEntry: Accept non-ASCII Keywords.
* DesktopEntry: Update list of environments valid for OnlyShowIn.
* Mime: Fix get_type_by_contents() in Python 3.
* RecentFiles: Minor bug fixes.

Version 0.20 (June 2012)
* Compatible with Python 3; requires Python 2.6 or later
* Clean up accidental GPL license notice in Menu.py
* Add test scripts for xdg.Mime, xdg.Locale and xdg.RecentFiles
* Fixes for icon theme validation
* Fix exception in xdg.Mime
* Replace invalid string exceptions
* Fall back to default base directories if $XDG* environment variables are
set but empty.
* Remove use of deprecated os.popen3 in Menu.py

... (truncated)

Commits

• 7db14dc Make universal wheels
• cadd68b Version number -> 0.26
• aa98604 Shorter title on docs
• ca188f1 Get version number for docs from module
• 6970744 Allow 'ScaledDirectories' key in icon theme file
• 056dbc1 Allow 'Scale' in icon theme per-directory sections
• c80f5ce Accept either x-glade or x-gtk-builder for glade UI file
• 8f28887 Switch tests away from problematic png mime type
• fcdeff5 Try installing package on Travis before testing
• 010a8ed Update GTK glade mimetype to newer name
• Additional commits viewable in compare view

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