Introduce CI pipeline

.github/workflows/ci.yml

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+name: CI pipeline
+
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
+    branches:
+      - "master"
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [2.7, 3.7]
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@v2
+      - name: set up python ${{ matrix.python-version }}
+        uses: action/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+      - name: run tests
+        run: pytest tests/test*

requirements.txt

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+pytest