message: Add jest & prettier to api devDeps
diff: "request": "^2.83.0",
  "request-promise-native": "^1.0.5",
  "winston": "^2.4.0"
  + },
  + "devDependencies": {
  + "jest": "^22.0.0",
  + "prettier": "^1.9.2"
  + },
  + "jest": {
  + "rootDir": ".",
  + "testEnvironment": "node"
  }
  }
  