Merge pull request #1742 from stripe/remi-bank-account-metadata

Add support for metadata on BankAccount creation

src/Stripe.net/Services/BankAccounts/BankAccountCreateOptions.cs

@@ -1,10 +1,18 @@
 namespace Stripe
 {
+    using System.Collections.Generic;
     using Newtonsoft.Json;
     using Stripe.Infrastructure;
 
-    public class BankAccountCreateOptions : BaseOptions
+    public class BankAccountCreateOptions : BaseOptions, IHasMetadata
     {
+        /// <summary>
+        /// A set of key/value pairs that you can attach to an object. It can be useful for storing
+        /// additional information about the object in a structured format.
+        /// </summary>
+        [JsonProperty("metadata")]
+        public Dictionary<string, string> Metadata { get; set; }
+
         /// <summary>
         /// REQUIRED. Either a token, like the ones returned by
         /// <a href="https://stripe.com/docs/stripe.js">Stripe.js</a>, or a