breaking: Correct video composition date and callback types (#494)

Author: childish-sambino

src/Twilio/Rest/Video/V1/CompositionHookResource.cs

@@ -595,7 +595,7 @@ public static CompositionHookResource FromJson(string json)
         /// The ISO 8601 date and time in GMT when the resource was last updated
         /// </summary>
         [JsonProperty("date_updated")]
-        public string DateUpdated { get; private set; }
+        public DateTime? DateUpdated { get; private set; }
         /// <summary>
         /// The unique string that identifies the resource
         /// </summary>
@@ -636,7 +636,7 @@ public static CompositionHookResource FromJson(string json)
         /// The URL to send status information to your application
         /// </summary>
         [JsonProperty("status_callback")]
-        public string StatusCallback { get; private set; }
+        public Uri StatusCallback { get; private set; }
         /// <summary>
         /// The HTTP method we should use to call status_callback
         /// </summary>

src/Twilio/Rest/Video/V1/CompositionResource.cs

@@ -481,12 +481,12 @@ public static CompositionResource FromJson(string json)
         /// Date when the media processing task finished
         /// </summary>
         [JsonProperty("date_completed")]
-        public string DateCompleted { get; private set; }
+        public DateTime? DateCompleted { get; private set; }
         /// <summary>
         /// The ISO 8601 date and time in GMT when the composition generated media was deleted
         /// </summary>
         [JsonProperty("date_deleted")]
-        public string DateDeleted { get; private set; }
+        public DateTime? DateDeleted { get; private set; }
         /// <summary>
         /// The unique string that identifies the resource
         /// </summary>