Merge pull request #1 from henrypinkard/main

add github action

.github/workflows/publish_pypi.yaml

@@ -0,0 +1,22 @@
+name: Build and Publish to PyPI using Flit
+
+on:
+  push:
+    paths:
+      - 'src/mmpycorex/_version.py'
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flit
+    - name: Build and publish
+      run: flit publish