Allow the project file to be added to a VS 2013 solution #66
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When attempting to use ICSharpCode.SharpZLib.csproj as part of a VS 2013 solution, an error occurs informing you that a one-way upgrade is required for compatibility. Adding the ToolsVersion property to the project file allows the project to be added to more recent VS solutions in a way that shouldn't break existing builds or solutions.
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