message: update vue peer dependency version
diff: {
  "name": "vee-validate",
  - "version": "2.0.0-rc.3",
  + "version": "2.0.0-rc.4",
  "description": "Simple Vue.js input validation plugin",
  "main": "dist/vee-validate.js",
  "typings": "types/index.d.ts",
  "vue": "^2.2.6"
  },
  "peerDependencies": {
  - "vue": "2.x"
  + "vue": ">= 2.2.0"
  }
  }
  