feat: add missing amazon.pl vendorId (#74)

Author: tusbar

marketplaces.json

@@ -139,7 +139,8 @@
     "region": "eu",
     "domain": "amazon.pl",
     "mwsDomain": "mws-eu.amazonservices.com",
-    "imagesDomain": "images-eu.ssl-images-amazon.com"
+    "imagesDomain": "images-eu.ssl-images-amazon.com",
+    "vendorId": "A2R2221NX79QZP"
   },
   {
     "code": "ca",