message: fix: Pin `marked` dependency to 2.0.x
  Allows installation to complete successfully on Node 10.8.0
  Fixes
diff: "handlebars": "^4.7.7",
  "lodash": "^4.17.21",
  "lunr": "^2.3.9",
  - "marked": "^2.0.3",
  + "marked": "~2.0.3",
  "minimatch": "^3.0.0",
  "progress": "^2.0.3",
  "shelljs": "^0.8.4",
  