Log Message:
audio/ncspot: update to 0.9.4

Maintenance
-Improved README (#683)
-More detailed error message in case of command parse error (#684)
-Remove panics in the update_token flow (#688)

Features
-Add exec command allowing users to execute shell commands on key press (#673)
-Set up release builds for armhf and arm64 (#659)
-Improved seek command to allow more units (e.g. 2s), check parse_duration
 documentation for accepted units (#682)
-Set terminal title to ncspot (#685)