update download link to new version 1.2.0

Author: ShaKaRee

doc/Download.html

@@ -36,7 +36,7 @@ <h2>Latest Release for C# / .NET</h2>
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 			<img src="image/download.gif" alt="Download Concordion.NET" height="50" width="50" /></td>
-            <td><b><a href="https://github.com/concordion/concordion-net/releases/download/v1.1.0/Concordion.NET-1.1.0.zip" id="download-link">Concordion.NET-1.1.0.zip</a></b></td>
+            <td><b><a href="https://github.com/concordion/concordion-net/releases/download/v1.2.0/Concordion.NET-1.2.0.zip" id="download-link">Concordion.NET-1.2.0.zip</a></b></td>
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