Closes #53: updating workflow actions, hopefully for alpha prerelease of 0.6.0

Author: JimCircadian

.github/workflows/pypi.yml

@@ -3,17 +3,17 @@ on:
   push:
     branches:
     - main
-    - 0.5_work
+    - v0.6.0_work
 jobs:
   build-publish:
     name: Build and publish
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@main
-    - name: Set up Python 3.6
+    - name: Set up Python 3.8
       uses: actions/setup-python@v1
       with:
-        python-version: 3.6
+        python-version: 3.8
     - name: Install and build
       run: python -m pip install build --user
     - name: Build a binary and source tarball