ci: speed up travis start time

The `trusty` env on travis now supports container based builds: https://docs.travis-ci.com/user/trusty-ci-environment/

Also adds cache for node_modules, and updates yarn lock.

This should improve start up time.

.travis.yml

@@ -1,8 +1,13 @@
 dist: trusty
-sudo: required
+sudo: false
 
 language: node_js
 
+cache:
+ yarn: true
+ directories:
+ - ./node_modules
+
 env:
  global:
  - DBUS_SESSION_BUS_ADDRESS=/dev/null
@@ -58,13 +63,7 @@ before_install:
  # Use a virtual display.
  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export DISPLAY=:99.0; fi
  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sh -e /etc/init.d/xvfb start; fi
- # Install latest chrome.
- - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CHROME_BIN=/usr/bin/google-chrome; fi
- - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get update; fi
- - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -y libappindicator1 fonts-liberation; fi
- - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb; fi
- - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo dpkg -i google-chrome*.deb; fi
- - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then echo "--no-sandbox" > ~/.config/chrome-flags.conf; fi
+ - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CHROME_BIN=chromium-browser; fi
  # Install yarn.
  - curl -o- -L https://yarnpkg.com/install.sh | bash
  - export PATH="$HOME/.yarn/bin:$PATH"

scripts/test-licenses.js

@@ -73,6 +73,7 @@ const ignoredPackages = [
  'extsprintf@1.0.2', // Looks like MIT
  'formatio@1.1.1', // BSD, but doesn't list it in package.json
  'indexof@0.0.1', // MIT, but doesn't list it in package.json
+ 'jschardet@1.4.2', // LGPL-2.1, listed as LGPL-2.1+.
  'map-stream@0.1.0', // MIT, license but it's not listed in package.json.
  'mime@1.2.11', // MIT, but doesn't list it in package.json
  'ms@0.7.1', // MIT, but doesn't list it in package.json