Build wheels on py 3.7

Author: wvangeit

.github/workflows/build.yml

@@ -20,10 +20,10 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Set up Python 3.6
+      - name: Set up Python 3.7
         uses: actions/setup-python@v2
         with:
-          python-version: 3.6
+          python-version: 3.7
 
       - name: Build a source tarball and wheel
         run: |
@@ -34,4 +34,4 @@ jobs:
         uses: pypa/gh-action-pypi-publish@master
         with:
           user: __token__
-          password: ${{ secrets.PYPI_PASSWORD }}
+          password: ${{ secrets.PYPI_PASSWORD }}