wslbridge 0.2.0

Changes since 0.1.0:

• Added a -C option that changes the working directory before running the
  command. The argument is a WSL path. A ~ component at the start of the
  argument is replaced with the user's home directory. (i.e. $HOME).
  #2
• The frontend now canonicalizes its path to the wslbridge-backend binary.
  #4