enh: setup GH Actions CI

pytables seems to provide wheels for py3.9 now, so we don't need to apt
install anything as we do on travis.

Fixes #97

.github/workflows/ci.yml

@@ -0,0 +1,51 @@
+name: Build
+
+on:
+  push:
+    branches: [ master, development ]
+  pull_request:
+    branches: [ master, development ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [2.7, 3.7, 3.8, 3.9]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Start MongoDB
+      uses: supercharge/[email protected]
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install flake8 pytest
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
+    - name: Build package
+      run: |
+        pip install .[full]
+
+    - name: Test with pytest
+      run: |
+        pytest
+
+    - name: Run examples
+      run: |
+        cd examples && python run_all.py
+
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics