Migrate project to GitHub actions

Travis CI is no longer open source friendly.

.github/workflows/check.yml

@@ -0,0 +1,33 @@
+name: Check
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    name: ${{ matrix.tox-environment }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        tox-environment:
+          - black
+          - flake8
+          - isort
+
+    env:
+      TOXENV: ${{ matrix.tox-environment }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+
+      - name: Install dependencies
+        run: python -m pip install tox
+
+      - name: Run
+        run: tox

.github/workflows/docs.yml

@@ -0,0 +1,25 @@
+name: Documentation
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    name: Documentation
+    runs-on: ubuntu-latest
+
+    env:
+      TOXENV: docs
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+
+      - name: Install dependencies
+        run: python -m pip install tox
+
+      - name: Run
+        run: tox

.github/workflows/test.yml

@@ -0,0 +1,49 @@
+name: Test
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    name: Python ${{ matrix.python-version }} / ${{ matrix.tox-environment }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - 3.6
+          - 3.7
+          - 3.8
+        tox-environment:
+          - django22
+          - django30
+          - django31
+          - djangomaster
+
+    env:
+      TOXENV: ${{ matrix.tox-environment }}
+
+    steps:
+      - name: Install LDAP libs
+        run: |
+          sudo apt-get update
+          # https://www.python-ldap.org/en/latest/installing.html#debian
+          sudo apt-get install slapd ldap-utils libldap2-dev libsasl2-dev
+          # https://github.com/python-ldap/python-ldap/issues/370
+          sudo apt-get install apparmor-utils
+          sudo aa-disable /usr/sbin/slapd
+
+      - uses: actions/checkout@v2
+
+      - 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 tox
+
+      - name: Run tests
+        run: tox