chore: Update using generator v7.2.4

.travis.yml

@@ -1,21 +1,16 @@
 sudo: false
 dist: trusty
 language: node_js
-node_js:
-  - 'lts/*'
+# node version is specified using the .nvmrc file
 before_install:
-- npm install -g greenkeeper-lockfile@1
+  - npm install -g greenkeeper-lockfile@1
 before_script:
-  - export CHROME_BIN=/usr/bin/google-chrome
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
   - greenkeeper-lockfile-update
-after_script: greenkeeper-lockfile-upload
+after_script:
+  - greenkeeper-lockfile-upload
 addons:
   firefox: latest
-  apt:
-    sources:
-    - google-chrome
-    packages:
-    - google-chrome-stable
+  chrome: stable