install twine

.github/workflows/deploy.yml

@@ -24,8 +24,7 @@ jobs:
                 python -m venv venv
                 source venv/bin/activate
                 pip install --upgrade pip
-                pip install black
-                sudo pip install flake8
+                sudo pip install twine
                 pip install -r requirements.txt -r requirements/dev.txt
               working-directory: xero-python