Update postman-request

Latest version of postman-request removes har-validator library which is EOL.

Author: davidcao1337

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "node-vault",
-  "version": "0.10.2",
+  "version": "0.10.3",
   "description": "Javascript client for HashiCorp's Vault",
   "main": "./src/index.js",
   "scripts": {
@@ -26,7 +26,7 @@
   "dependencies": {
     "debug": "^4.3.4",
     "mustache": "^4.2.0",
-    "postman-request": "^2.88.1-postman.33",
+    "postman-request": "^2.88.1-postman.42",
     "tv4": "^1.3.0"
   },
   "devDependencies": {