Update azure-pipelines.yml
Try to work around "conflict with the backend dependencies: wheel==0.33.1 is incompatible with wheel<0.33.0,>=0.32.0"
@@ -55,7 +55,7 @@ jobs:
architecture: 'x64'
- script: |
- python -m pip install --upgrade pip wheel
+ python -m pip install --upgrade pip==18.1
pip install -r requirements.txt
displayName: 'Install dependencies'
