v0.4.2 released

Notable changes:

• Added around-next-single, a variant of around-next that will
  release its context on any change, as opposed to only on the release
  of the 'arounded' button.
• Added default compose sequence for Ü
• Added a sticky-key
• Added --version (-V) flag
• Added +, for "add a cedilla"
• Added :timeout-button keyword to tap-hold-next and
  tap-hold-next-release, so that they can switch to a button
  other than the hold button when the timeout expires.
• The multi-tap key now immediately taps the current key when another
  key is pressed during tapping.
• Fixed compilation error under Mac, having to do with typo in Keycodes.
• Fixed issue with empty-names for uinput-sinks.
• Ignore SIGCHLD to deal with non-termination bug.

v0.4.1

Added the ability to run shell-commands

0.4.0

• Completely refactored internals
• Completely revamped configuration language
• Added MacOS support

0.3.0

Major change is the addition of Windows support. Additionally we added some bugfixes and streamlined the processing model a bit for cross-platform support.

0.2.0

Bugfixes, better support for special characters, new buttons, perma-switching to layers, customized naming uinput sink.

0.1.0

The very first experimental release of KMonad.