v3.16.0

Added

• Commands that would start or exec into a docker container now have a
  --user flag to switch the user used

• new plugin user-mapping to change the uid and gid of users and
  groups in container when it starts.

  Can be configured with --user-mapping-users flag to private the
  list of users to map. Also --user-mapping-owner boolean flag if
  you want the ISC instance owner to have its uid and gid changed to
  the uid and gid of the host user running iscenv.

  In your config file these would look like:

  start:
    user-mapping-users: 'example:example:1001:1001'
    user-mapping-owner: true