Core,Tests: fix SendUploadedPhoto

It got broken in one [1] of the LayerUpdate PR [2]
commits because TLInputMediaUploadedPhoto's [3]
Caption property was dropped, but somehow the
replacement of it is now TLRequestSendMedia's [4]
Message property.

[1] 07c4812e99
[2] https://github.com/nblockchain/TgSharp/pull/13
[3] 07c4812e99 (diff-8fc2b6f90844589a5a85c31971236c6a)
[4] 07c4812e99 (diff-6579e69beaef1ce3efce20d9f9a087ea)

src/TgSharp.Core/TelegramClient.cs

@@ -336,13 +336,18 @@ namespace TgSharp.Core
                 .ConfigureAwait(false);
         }
 
-        public async Task<TLAbsUpdates> SendUploadedPhoto(TLAbsInputPeer peer, TLAbsInputFile file, CancellationToken token = default(CancellationToken))
+        public async Task<TLAbsUpdates> SendUploadedPhoto(TLAbsInputPeer peer, TLAbsInputFile file, string message, CancellationToken token = default(CancellationToken))
         {
+            if (String.IsNullOrEmpty(message)) {
+                throw new ArgumentNullException (nameof (message));
+            }
+
             return await SendAuthenticatedRequestAsync<TLAbsUpdates>(new TLRequestSendMedia()
             {
                 RandomId = Helpers.GenerateRandomLong(),
                 Background = false,
                 ClearDraft = false,
+                Message = message,
                 Media = new TLInputMediaUploadedPhoto() { File = file },
                 Peer = peer
             }, token)

src/TgSharp.Tests.NUnit/Test.cs

@@ -36,7 +36,6 @@ namespace TgSharp.Tests
         }
 
         [Test]
-        [Ignore("Untested in CI")]
         public override async Task SendPhotoToContactTest()
         {
             await base.SendPhotoToContactTest();

src/TgSharp.Tests/TgSharpTests.cs

@@ -206,7 +206,7 @@ namespace TgSharp.Tests
                 .FirstOrDefault(x => x.Phone == NumberToSendMessage);
 
             var fileResult = (TLInputFile)await client.UploadFile("cat.jpg", new StreamReader("data/cat.jpg"));
-            await client.SendUploadedPhoto(new TLInputPeerUser() { UserId = user.Id }, fileResult);
+            await client.SendUploadedPhoto(new TLInputPeerUser() { UserId = user.Id }, fileResult, "cat");
         }
 
         public virtual async Task SendBigFileToContactTest()