Allow for current VS stable. (#5835)

Make.config

@@ -60,7 +60,7 @@ MIN_XM_MONO_URL=https://xamjenkinsartifact.azureedge.net/build-package-osx-mono/
 # Minimum Visual Studio version
 MIN_VISUAL_STUDIO_URL=https://bosstoragemirror.azureedge.net/vsmac/7a/7aff2dc1f28d711d11d63d79b2a4c49cda217189/VisualStudioForMac-Preview-7.7.0.1470.dmg
 MIN_VISUAL_STUDIO_VERSION=7.7.0.1470
-MAX_VISUAL_STUDIO_VERSION=7.8.99
+MAX_VISUAL_STUDIO_VERSION=8.0.99
 
 # Minimum CMake version
 MIN_CMAKE_URL=https://cmake.org/files/v3.6/cmake-3.6.2-Darwin-x86_64.dmg