switch to GitHub workflows for CI

Also drop -j from Make, as it saves little time and makes errors
harder to read.

.github/workflows/pythonpackage.yml

@@ -0,0 +1,30 @@
+name: Checks
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [3.6, 3.7]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - name: Install dependencies
+        run: |
+          sudo apt install portaudio19-dev
+          pip install -r requirements.qt
+      - name: Run checks
+        run: |
+          make check pytype
+

.travis.yml

@@ -1,20 +0,0 @@
-dist: xenial
-language: python
-os: linux
-install:
-  - sudo apt-get update
-  - sudo apt-get install portaudio19-dev npm
-  - pip install -r requirements.qt
-
-jobs:
-  include:
-    - python: 3.6
-      script: make -j 4 check pytype
-    - python: 3.7
-      script: make -j 4 check pytype
-
-notifications:
-  email:
-    if: branch = "master"
-    recipients:
-      - secure: "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"