Update UpdateCdnEndpoint TTL property

Author: trmcnvn

DigitalOcean.API/Models/Requests/UpdateCdnEndpoint.cs

@@ -6,7 +6,7 @@ public class UpdateCdnEndpoint {
         /// The amount of time the content is cached by the CDN's edge servers in seconds.
         /// </summary>
         [JsonProperty("ttl")]
-        public int? TTL { get; set; }
+        public int? Ttl { get; set; }
 
         /// <summary>
         /// The ID of a DigitalOcean managed TLS certificate used for SSL when a custom subdomain is provided.