Update nanoFramework.Graphics.nuspec (#72)

***NO_CI***

Author: networkfusion

nanoFramework.Graphics.nuspec

@@ -17,7 +17,7 @@
     <copyright>Copyright (c) .NET Foundation and Contributors</copyright>
     <description>
       This package includes the nanoFramework.Graphics assembly for nanoFramework C# projects.
-      This package requires a target with nanoFramework.Networking.Sntp v$nativeVersion$ (checksum $checksum$).</description>
+    </description>
     <tags>nanoFramework C# csharp netmf netnf nanoFramework.Graphics</tags>
     <dependencies>
       <dependency id="nanoFramework.CoreLibrary" version="1.10.5" />
@@ -37,4 +37,4 @@
     <file src="assets\nf-logo.png" target="" />
     <file src="LICENSE.md" target="" />
   </files>
-</package>
+</package>