fixing msbuild nuget package version

Author: masnider

Voting/Voting.sfproj

@@ -5,7 +5,7 @@
     <ProjectGuid>af958126-cb44-487a-8292-2d27594966de</ProjectGuid>
     <ProjectVersion>2.0</ProjectVersion>
     <MinToolsVersion>1.5</MinToolsVersion>
-    <SupportedMSBuildNuGetPackageVersion>1.6.4</SupportedMSBuildNuGetPackageVersion>
+    <SupportedMSBuildNuGetPackageVersion>1.7.1</SupportedMSBuildNuGetPackageVersion>
   </PropertyGroup>
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|x64">