remove vs2019 preview workaround

Author: Oren Novotny

azure-pipelines.ix.yml

@@ -30,7 +30,7 @@ variables:
 steps:
 - task: DotNetCoreInstaller@0
   inputs:
-    version: '3.0.100-preview4-010530'
+    version: '3.0.100-preview4-011033'
 
 - task: DotNetCoreCLI@2  
   inputs:

azure-pipelines.rx.yml

@@ -32,7 +32,7 @@ jobs:
   steps:
   - task: DotNetCoreInstaller@0
     inputs:
-      version: '3.0.100-preview4-010374'
+      version: '3.0.100-preview4-011033'
 
   - task: DotNetCoreCLI@2  
     inputs:
@@ -44,9 +44,6 @@ jobs:
   - script: nbgv cloud -a -p Rx.NET/Source
     displayName: Set Version
 
-  - powershell: iex ((New-Object System.Net.WebClient).DownloadString('https://raw.githubusercontent.com/onovotny/UpdateVsOnAgent/master/Fix-VisualStudioPreviewNuGetSdk.ps1'))
-    displayName: VS Preview workaround
-
   - task: MSBuild@1
     displayName: Build System.Reactive.sln
     inputs: