Update azure-pipelines.rx.yml

azure-pipelines.rx.yml

@@ -123,7 +123,7 @@ jobs:
       arguments: install --tool-path . nbgv
     displayName: Install NBGV tool
 
-  - script: ./nbgv cloud -a -p Rx.NET\Source
+  - script: ./nbgv cloud -a -p Rx.NET/Source
     displayName: Set Version
 
   - task: DownloadBuildArtifacts@0