README.md in gameball-2.0.1 vs README.md in gameball-2.1.1

@@ -186,11 +186,11 @@
 ```ruby
 Gameball::Transaction.refund({
    playerUniqueId:"player456",
    transactionId:"1234567890",
    reverseTransactionId:"234567891",
-   amount: null
+   amount: nil
 }
 )
 ```
 
 #### Reverse Hold Example
@@ -245,11 +245,11 @@
     },
     {
       productId:"875511",
       title: "XPS-15s",
       category: [
-        electronics
+        "electronics"
       ],
       vendor: "Dell"
     }
   ],
   discountCodes: [
@@ -259,10 +259,10 @@
   extra: {
     paymentMethod: "credit card",
     billingAddress: "Alabama"
   },
   redeemedAmount: 20,
-  holdReference: null,
+  holdReference: nil,
   guest: false
 })
 ```
 #### Leaderboard