message: Upgrade vulnerable node modules
  Summary: reports 4 vulnerabilities, 2 of which are critical. Upgrades ripple-lib, superagent, and lodash to their latest versions, and removes argparse (unused dependency)
  Reviewers: arik, kevin, bigly, zacleids
  Subscribers: ben
diff: "lint": "./node_modules/.bin/eslint --ext .js ."
  },
  "dependencies": {
  - "argparse": "~0.1.16",
  + "argparse": "~1.0.10",
  "assert": "0.4.9",
  "big.js": "~3.1.3",
  "bigi": "1.4.0",
  "eol": "0.5.0",
  "express": "~4.16.2",
  "http-proxy": "1.11.1",
  - "lodash": "4.13.1",
  + "lodash": "^4.17.10",
  "minimist": "0.2.0",
  "moment": "~2.20.1",
  "morgan": "1.9.0",
  "prova-lib": "0.2.9",
  - "ripple-lib": "~0.17.7",
  + "ripple-lib": "~0.22.0",
  "sanitize-html": "1.13.0",
  "secrets.js-grempe": "1.1.0",
  "stellar-base": "~0.7.7",
  - "superagent": "~3.5.2",
  + "superagent": "~3.8.3",
  "superagent-proxy": "~1.0.0",
  "underscore.string": "2.4.0"
  },
  