Switch to GitHub actions for publishing packages to PyPi (#144)

Remove Travis CI and utilize GitHub actions for publishing packages.

.github/workflows/pythonpublish.yml

@@ -0,0 +1,26 @@
+name: Publish Python Package to PyPi
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install build
+          pip install -r requirements.txt
+      - name: Build package
+        run: python -m build
+      - name: Publish package
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}