message: chore(core): enable eslint in CI
  Use `--quiet` because we have too many warnings
  Issue:
diff: "unit-test": "nyc -- mocha --opts test/mocha.opts \"test/unit/*.ts\" \"test/unit/**/*.ts\" \"test/v2/unit/*.ts\" \"test/v2/unit/**/*.ts\"",
  "integration-test": "nyc -- mocha --opts test/mocha.opts \"test/v2/integration/**/*.ts\"",
  "browser-test": "karma start karma.conf.js",
  - "lint": "eslint 'src/**/*.ts' && eslint 'test/**/*.ts' || true",
  + "lint": "eslint --quiet .",
  "audit": "if [ \"$(npm --version | cut -d. -f1)\" -ge \"6\" ]; then npm audit; else echo \"npm >= 6 required to perform audit. skipping...\"; fi",
  "clean": "rm -r dist/*",
  "build": "tsc && node scripts/copySjcl.js",
  