Update README.md

Added Await keyword to example text.

README.md

@@ -15,7 +15,7 @@ ObjectivePaths is a wrapper for .NET filesystem operations. ObjectivePaths attem
 
     // File Copying:
     var newFile = directory.GetFile("newNonExistingFile.txt");
-    fileTwoLevelsDown.CopyToAsync(newFile, overwrite: false, CancellationToken.None);
+    await fileTwoLevelsDown.CopyToAsync(newFile, overwrite: false, CancellationToken.None);
 
 Contributors: please review LICENSE.txt before using the library or submitting a contribution. All Subissions must be released under the MIT License (https://opensource.org/license/mit/) in order to be compatible with the project's dual-license model.