fix build

.github/release-drafter.yml

@@ -1,4 +0,0 @@
-template: |
-  ## What's Changed
-
-  $CHANGES

azure-pipelines.ix.yml

@@ -14,7 +14,6 @@ pr:
     include:
       - master
       - rel/*
-      - IxAsyncCSharp8
   paths:
     include:
       - Ix.NET/Source/*
@@ -46,8 +45,6 @@ steps:
 - task: DotNetCoreCLI@2
   inputs:
     command: restore
-    feedsToUse: config
-    nugetConfigPath: Ix.NET/Source/NuGet.config
     projects: Ix.NET/Source/**/*.csproj
   displayName: Restore
 

azure-pipelines.rx.yml

@@ -35,6 +35,7 @@ jobs:
     inputs:
       version: '3.0.100-preview8-013656'
       includePreviewVersions: true
+      performMultiLevelLookup: true
 
   - task: DotNetCoreCLI@2
     inputs:
@@ -213,6 +214,7 @@ jobs:
     inputs:
       version: '3.0.100-preview8-013656'
       includePreviewVersions: true
+      performMultiLevelLookup: true
 
   - task: DotNetCoreCLI@2
     inputs: