message: update feathers dev dependency
diff: "babel-plugin-add-module-exports": "^0.2.0",
  "babel-plugin-transform-object-assign": "^6.3.13",
  "babel-preset-es2015": "^6.3.13",
  - "feathers": "^2.0.0-pre.1",
  + "feathers": "^2.0.0",
  "feathers-commons": "^0.7.2",
  "feathers-hooks": "^1.5.2",
  "feathers-memory": "^0.8.0",
  