README.md in bckbn-2.2.1 vs README.md in bckbn-3.0.0

@@ -18,11 +18,11 @@
 ```ruby
 require "bckbn"
 
 Bckbn.api_base = "..."
 Bckbn.access_token = "..."
-Bckbn.merchant_id = "..."
+Bckbn.worldpay_merchant_id = "..."
 
 Bckbn::Transaction.capture({ 
   litle_txn_id: "13254123434",
   id: "12345",
   report_group: "ABC Division"
@@ -34,11 +34,11 @@
 ```ruby
 require "bckbn"
 
 api_base = "..."
 access_token = "..."
-merchant_id = "..."
+worldpay_merchant_id = "..."
 idempotency_key = "..."
 
 Bckbn::Transaction.capture(
   { 
     litle_txn_id: "13254123434",
@@ -46,10 +46,10 @@
     report_group: "ABC Division"
   }, 
   {
     api_base: api_base,
     access_token: access_token,
-    merchant_id: merchant_id,
+    worldpay_merchant_id: worldpay_merchant_id,
     idempotency_key: idempotency_key
   }
 )
 ```