Use GitHub Actions instead of Travis CI

.github/workflows/lint-python.yml

@@ -0,0 +1,21 @@
+name: lint_python
+on: [pull_request, push]
+jobs:
+  lint_python:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - run: pip install bandit black codespell flake8 isort mypy pytest pyupgrade safety
+      - run: bandit --recursive --skip B101,B105,B106,B110,B303,B404,B603 .
+      - run: black --check . || true
+      - run: codespell || true  # --ignore-words-list="" --skip=""
+      - run: flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+      - run: flake8 . --count --exit-zero --max-complexity=29 --max-line-length=167 --show-source --statistics
+      - run: isort --check-only --profile black . || true
+      - run: pip install -e .
+      - run: mypy --ignore-missing-imports . || true
+      - run: mv setup.cfg setup.cfg.disabled
+      - run: pytest .
+      - run: shopt -s globstar && pyupgrade --py36-plus **/*.py || true
+      - run: safety check

.github/workflows/tox.yml

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+name: tox
+on: [push, pull_request]
+jobs:
+  tox:
+    strategy:
+      fail-fast: false
+      max-parallel: 4
+      matrix:
+        python: [3.6, 3.7, 3.8, 3.9]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - run: pip install tox
+      - if: matrix.python == '3.6'
+        run: TOXENV=py36 tox
+      - if: matrix.python == '3.7'
+        run: TOXENV=py37 tox
+      - if: matrix.python == '3.8'
+        run: TOXENV=py38 tox
+      - if: matrix.python == '3.9'
+        run: TOXENV=py39 tox