(GH-85) Disposed of stream

Author: gep13

Source/GitReleaseManager.Cli/Program.cs

@@ -273,6 +273,9 @@ private static async Task AddAssets(GitHubClient github, IList<string> assets, R
                     };
 
                     await github.Release.UploadAsset(release, upload);
+
+                    // Make sure to tidy up the stream that was created above
+                    upload.RawData.Dispose();
                 }
             }
         }