Replace travis with GitHub Actions (#2652)

.github/workflows/fail-master-prs.yml

@@ -0,0 +1,14 @@
+name: PRs against master are not accepted, please target develop branch
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  fail:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fail PRs against master
+        run: |
+          echo "PRs must be made aginst the develop branch."
+          exit 1

.github/workflows/run-tests.yml

@@ -0,0 +1,35 @@
+
+name: Run tests
+
+on:
+  push:
+  pull_request:
+    branches-ignore: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
+        os: [ubuntu-latest, macOS-latest, windows-latest ]
+        include:
+          # Python 3.4 is not available on mac and windows so it needs to to
+          # be manually added to the matrix for linux.
+          - python-version: 3.4
+            os: ubuntu-latest
+
+    steps:
+    - 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 scripts/ci/install
+    - name: Run tests
+      run: |
+        python scripts/ci/run-tests