message: schema: Update json message schema to draft 6
diff: {
  - "$schema": "http://json-schema.org/draft-04/schema#",
  + "$schema": "http://json-schema.org/draft-06/schema#",
  "title": "Buttplug Message Schema",
  "version": "0.0.1",
  "description": "The JSON Protocol format for the Buttplug Protocol",
  