Merge pull request #8 from NASA-IMPACT/githb_actions

Include CI workflow for running tests in tox.

.github/workflows/tox_tests.yml

@@ -0,0 +1,22 @@
+name: Tox tests
+
+on: [push]
+
+jobs:
+  build_test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: [3.6]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Install Tox and any other packages
+        run: pip install tox
+      - name: Run Tox
+        # Run tox using the version of Python in `PATH`
+        run: tox -e py