khal: updated to 0.10.4

0.10.4
======
2021-07-29

* DROPPED support for Python 3.5
* CHANGE ikhal: tab (and shift tab) jump from the events back to the calendar
* NEW Add symbol for events with at least one alarm
* FIX URL can now be set/updated from ikhal
* FIX Imported events without an end or duration will now last one day if
  `DTSTART` is a date (as per RFC) or one hour if it is a datetime.

0.10.3
======
2021-04-27

* DROPPED support for Python 3.4
* FIX `khal interactive` now accepts -a/-d options (as documented)
* FIX Strip whitespace when loading `displayname` and `color` files
* FIX Warn when loading events with a recurrence that finishes before it starts
* FIX Warn when loading events with a recurrence that never occurs
* FIX Alarms without descriptions no longer crash `ikhal`
* FIX Display all-day events at the top of the day in `ikhal`
* FIX Keybindings in empty search results no longer crash `ikhal`
* NEW Possibility to add a blank line before day in `khal` with
  `blank_line_before_day` option
* FIX `new` keybinding in search no longer crash `ikhal`
* NEW Improved sorting of events. Sort by `DTSTART`, `DTEND` then `SUMMARY`.
* NEW Add url input and `{url}` template option

(adam)