Update README.md

Author: Thefrank

README.md

@@ -1,7 +1,7 @@
 # dotnet-freebsd-crossbuild
 Bash script and patches for building dotNET for FreeBSD under Linux
 
-Currently working for: 8.0-preview-4 7.0.306, 6.0.412(? upstream SDK tag missing), and older (check commits and/or tags if you want to build old versions)
+Currently working for: 8.0-preview-6, 7.0.306, 6.0.412(? upstream SDK tag missing), and older (check commits and/or tags if you want to build old versions)
 
 ## Why would I use this?
 You don't need / want SDK builds in Azure DevOPS