.travis.yml in Dhalang-0.3.1 vs .travis.yml in Dhalang-0.4.0

@@ -1,9 +1,13 @@
 language: ruby
+node_js:
+ - node
 rvm:
  - 2.6
 addons:
   chrome: stable
+before_install:
+ - nvm install v15.0.1
 install:
  - bundle install
  - npm install
 script: bundle exec rake spec
\ No newline at end of file