update travis to replace deprecated distro

.travis.yml

@@ -1,10 +1,10 @@
 language: node_js
 node_js:
   - "12"
-dist: trusty
+dist: bionic
 addons:
   - chrome: stable
-install: "npm install"
+# install: "npm install"
 script: "sh -e run_tests.sh"
 notifications:
   email: false

test/karma.conf.js

@@ -29,7 +29,7 @@ module.exports = function (config) {
     customLaunchers: {
       ChromeHeadlessNoSandbox: {
         base: 'ChromeHeadless',
-        flags: ['--no-sandbox', '--disable-setuid-sandbox']
+        flags: ['--no-sandbox']
       }
       
     },