Use GitHub actions

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: Tests
+
+on:
+  pull_request:
+  push:
+    branches: master
+
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v1
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Install Dependencies
+        run: python3 -m pip install -U pip -r requirements.txt
+      - name: Build Docs
+        run: sphinx-build -n -W -q -b html -d _build/doctrees . _build/html