Upgrade Travis CI

.travis.yml

@@ -1,29 +1,18 @@
-sudo: false
-
+language: node_js
 os:
   - osx
   - linux
-
-cache:
-  bundler: true
-  directories:
-  - node_modules # NPM packages
-
-before_install:
-  - if [ $TRAVIS_OS_NAME == "linux" ]; then
-      export CXX="g++-4.9" CC="gcc-4.9" DISPLAY=:99.0;
-      sh -e /etc/init.d/xvfb start;
-      sleep 3;
-    fi
+node_js: 12
 
 install:
-  - npm install
-  - npm run vscode:prepublish
-
+  - |
+    if [ $TRAVIS_OS_NAME == "linux" ]; then
+      export DISPLAY=':99.0'
+      /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
+    fi
 script:
-  - npm run-script coverage_travis
+  - |
+    echo ">>> Run integration test"
+    npm install && npm run compile && npm run coverage_travis
 after_script: "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"
-
-language: node_js
-node_js:
-  - "10"
+cache: npm