message: Add lint script to package.json
diff: "compile": "gulp compile",
  "build": "gulp build",
  "watch": "tsc -watch -p ./",
  + "lint": "yarn eslint ./src/**/*.{ts,tsx}",
  "postinstall": "node ./node_modules/vscode/bin/install",
  "test": "npm run compile && node ./node_modules/vscode/bin/test",
  "template-tests": "node ./out/scripts/generate-test && node ./out/scripts/run-tests",
  