Updated travis install.

Author: JacOng17

.travis.yml

@@ -1,13 +1,10 @@
 sudo: required
 language:
   - ruby
-  - node_js
-node_js:
-  - "10"
 cache:
   bundler: true
-  directories: "node_modules"
-services:
+  yarn: true
+  services:
   - postgresql
 
 # Note: we will build pull requests, and these branches
@@ -38,8 +35,13 @@ before_install:
 - chmod +x ./cc-test-reporter
 - export PATH=$PWD/geckodriver:$PATH
 
+install:
+  - nvm install 10
+  - npm i -g yarn
+  - bundle install
+  - yarn install
+
 before_script:
-- yarn install
 - ./scripts/install_phantomjs.sh
 - RAILS_ENV=test bundle exec rake db:create db:migrate
 - RAILS_ENV=test bundle exec rake assets:precompile