Follow-up to r300225: update ClangFormat.csproj too

llvm-svn: 300231

Author: zmodem

clang/tools/clang-format-vs/ClangFormat/ClangFormat.csproj

@@ -14,7 +14,7 @@
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>Key.snk</AssemblyOriginatorKeyFile>
     <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
-    <MinimumVisualStudioVersion>14.0</MinimumVisualStudioVersion>
+    <MinimumVisualStudioVersion>15.0</MinimumVisualStudioVersion>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
     <UpgradeBackupLocation>