Update package.json

^ syntax does not work correctly in all cases for prerelease packages

Author: SierraNL

package.json

@@ -26,7 +26,7 @@
   "dependencies": {
     "debug": "^4.3.4",
     "mustache": "^4.2.0",
-    "postman-request": "^2.88.1-postman.42",
+    "postman-request": "2.88.1-postman.42",
     "tv4": "^1.3.0"
   },
   "devDependencies": {