Log Message:
Updated khal to 0.9.3.

0.9.3
=====
released 2017-03-06

* FIX `list` (and commands based on it like `calendar`, `at`, and `search`)
  crashed if `--notstarted` was given and allday events were found (introduced
  in 0.9.2)
* FIX `list --notstarted` (and commands based on it) would show events only on
  the first day of their occurrence and not on all further days
* FIX `configure` would crash if neither "import config from \ 
vdirsyncer" nor
  "create locale vdir" was selected
* FIX `at` will now show an error message if a date instead of a datetime is
  given
* FIX `at`'s default header will now show the datetime queried for (instead of
  just the date)
* FIX validate vdir metadata in color files
* FIX show the actually configured keybindings in ikhal

* NEW khal will now show cancelled events with a big CANCELLED in front (can be
  configured via event formatting)
* NEW ikhal supports editing an event's raw icalendar content in an external
  editor ($EDITOR), default keybinding is `alt + shift + e`. Only use this, if
  you know what you are doing, the icalendar library we use doesn't do a lot of
  validation, it silently disregards most invalid data.