Fix the inhereted version number

Author: David Crow

src/Directory.Build.props

@@ -1,2 +1,4 @@
 <Project>
+  <!-- Import parent Directory.Build.props to inherit version properties -->
+  <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
 </Project>