0.2.6

CHANGES:

Added

• Add a depext subcommand to install the external system dependencies listed
  in lock file (#207, @samoht)
• Add the --keep-git-dir flag to the pull command that can be used to keep
  the [.git] directory after pulling the vendored sources. (#160, @rizo)

Fixed

• Fix tool name in generated dune file so that it does not refer to the tool as
  duniverse (#206, @emillon)