Enhance the Client to retrieve user name asynchronously

Author: AOrlov

Git.hub/Client.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
 using RestSharp;
 using RestSharp.Authenticators;
 
@@ -148,7 +149,7 @@ public User getCurrentUser()
             return user.Data;
         }
 
-        public User GetUser(string userName)
+        public async Task<User> GetUserAsync(string userName)
         {
             if (string.IsNullOrEmpty(userName))
             {
@@ -157,10 +158,22 @@ public User GetUser(string userName)
 
             var request = new RestRequest($"/users/{userName}");
 
-            var user = client.Get<User>(request);
+            var user = await client.ExecuteGetTaskAsync<User>(request);
             return user.Data;
         }
 
+        public User GetUser(string userName)
+        {
+            if (string.IsNullOrEmpty(userName))
+            {
+                throw new ArgumentException("Empty username", nameof(userName));
+            }
+
+            var request = new RestRequest($"/users/{userName}");
+
+            return  client.Get<User>(request).Data;
+        }
+
         /// <summary>
         /// Searches through all of Github's repositories, similar to the search on the website itself.
         /// </summary>