re-add travis-ci

removed in 33d652c

.travis.yml

@@ -0,0 +1,29 @@
+dist: bionic
+language: node_js
+node_js:
+- 12
+
+addons:
+  apt:
+    packages:
+      - pulseaudio
+
+env:
+  matrix:
+    - BROWSER=chrome  BVER=stable
+
+matrix:
+  fast_finish: true
+
+before_script:
+  - ./node_modules/travis-multirunner/setup.sh
+  - pulseaudio --start
+  - export DISPLAY=:99.0
+  - sh -e /etc/init.d/xvfb start
+
+script:
+  - npm test && npm run test-travis
+
+after_failure:
+  - for file in *.log; do echo $file; echo "======================"; cat $file; done || true
+