message: Add lint scripts for src and test
diff: "main": "dist/index.js",
  "scripts": {
  "build": "tsc",
  - "lint": "eslint --ext .ts src",
  + "lint": "yarn lint:src && yarn lint:test",
  + "lint:src": "eslint --ext .ts src",
  + "lint:test": "eslint --ext .test.ts test",
  "test": "jest"
  },
  "keywords": [
  