message: chore(dev-deps): remove unused dev deps
diff: "chai": "^4.1.2",
  "esm": "^3.2.25",
  "gitty": "^3.6.0",
  - "if-env": "^1.0.0",
  "jsdom": "16.2.2",
  "jsonfile": "^6.0.1",
  "nyc": "^15.0.1",
  "require-from-string": "^2.0.2",
  - "requirejs": "2.3.6",
  "sinon": "^9.0.0",
  "sinon-chai": "^3.0.0",
  "source-map-support": "0.5.19",
  