CI setup with GitHub Actions

.github/workflows/ci-mac.yml

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+name: "FileCheck.py on macOS"
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: macOS-latest
+
+    strategy:
+      matrix:
+        python-version: [3.5, 3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Upgrade pip
+      run: |
+        python -m pip install --upgrade pip
+
+    - name: Install Poetry
+      run: |
+        curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python
+        echo ::set-env name=PATH::$HOME/.poetry/bin:$PATH
+
+    - name: Install dependencies
+      run: |
+        poetry config virtualenvs.in-project true
+        poetry install
+
+    - name: Run tests
+      run: |
+        poetry run invoke test

.github/workflows/ci-ubuntu.yml

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+name: "FileCheck.py on Ubuntu"
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: [3.5, 3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Upgrade pip
+      run: |
+        python -m pip install --upgrade pip
+
+    - name: Install Poetry
+      run: |
+        curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python
+        echo ::set-env name=PATH::$HOME/.poetry/bin:$PATH
+
+    - name: Install dependencies
+      run: |
+        poetry config virtualenvs.in-project true
+        poetry install
+
+    - name: Run tests
+      run: |
+        poetry run invoke test