install twine for uploading

Author: jcapriot

azure-pipelines.yml

@@ -143,6 +143,7 @@ stages:
             set -o errexit
             python3 -m pip install --upgrade pip
             pip3 install cibuildwheel==2.16.2
+            pip3 install twine
           displayName: Install dependencies
         - bash: cibuildwheel --output-dir wheelhouse .
           displayName: Build wheels
@@ -168,6 +169,7 @@ stages:
             set -o errexit
             python3 -m pip install --upgrade pip
             python3 -m pip install cibuildwheel==2.16.2
+            python3 -m pip install twine
           displayName: Install dependencies
         - bash: cibuildwheel --output-dir wheelhouse .
           displayName: Build wheels
@@ -193,6 +195,7 @@ stages:
             set -o errexit
             python -m pip install --upgrade pip
             pip install cibuildwheel==2.16.2
+            pip install twine
           displayName: Install dependencies
         - bash: cibuildwheel --output-dir wheelhouse .
           displayName: Build wheels