Update main.yml

Author: AurelienJaquier

.github/workflows/main.yml

@@ -49,8 +49,9 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: 3.6
-      - name: Build a source tarball
-        run:
+      - name: Build a source tarball and wheel
+        run: |
+            pip install wheel
             python setup.py sdist bdist_wheel
 
       - name: Publish package to PyPI