v0.1.8

Added

• dahrk status reports locally, without dialling, whether this node is enrolled, which runtimes it
  serves, and whether the service is running. (#36)

Fixed

• dahrk service install writes the service unit 0600, and re-installing tightens the mode on a
  unit an older client left readable. (#36)
• The installed service points at a stable Node path that survives a brew upgrade node; re-run
  dahrk service install to repin. (#36)
• A token the hub accepts is cached in ~/.dahrk/node.json (0600), so later runs re-attach as the
  same node without one. (#36)