Update Readme

Author: HenryEffiong

README.md

@@ -67,7 +67,7 @@ _
          email: "customer@customer.com"  
      );            
         final Flutterwave flutterwave = Flutterwave(
-	        context: context, publicKey: "Public Key-here,
+	        context: context, publicKey: "Public Key-here",
     		currency: "currency-here",   
             redirectUrl: "add-your-redirect-url-here"   
             txRef: "add-your-unique-reference-here",   
@@ -123,4 +123,4 @@ Copyright (c) Flutterwave Inc.
 
 - [Flutterwave API Doc](https://developer.flutterwave.com/docs)
 - [Flutterwave Inline Payment Doc](https://developer.flutterwave.com/docs/flutterwave-inline)
-- [Flutterwave Dashboard](https://dashboard.flutterwave.com/login)
+- [Flutterwave Dashboard](https://dashboard.flutterwave.com/login)