Bump to preview 6

azure-pipelines.ix.yml

@@ -31,7 +31,7 @@ variables:
 steps:
 - task: DotNetCoreInstaller@0
   inputs:
-    version: '3.0.100-preview5-011568'
+    version: '3.0.100-preview6-012264'
 
 - task: DotNetCoreCLI@2  
   inputs: