Add Postman REST Client

[Alex Mirrington]

Support for Postman UA strings would be great. Currently, the UA string is parsed as follows:

{
  "Device": {
    "IsSpider": false,
    "Brand": "",
    "Family": "Other",
    "Model": ""
  },
  "OS": {
    "Family": "Other",
    "Major": null,
    "Minor": null,
    "Patch": null,
    "PatchMinor": null
  },
  "Browser": {
    "Family": "Other",
    "Major": null,
    "Minor": null,
    "Patch": null
  },
  "UserAgent": "PostmanRuntime/7.22.0"
}