Correct version fallback
Correct version fallback

If no version is provided, grunt-msbuild will search for all installed versions of MSBuild and choose the newest one. If none are found, it will default to .NET 4.0. This was added in https://github.com/stevewillcock/grunt-msbuild/commit/6ccf6a40860745dee70ce5f9feeb7093494cb8bf
stevewillcock/grunt-msbuild,stevewillcock/grunt-msbuild