.travis.yml in revealing-1.0.5 vs .travis.yml in revealing-1.0.7

@@ -1,7 +1,17 @@
 ---
-sudo: false
+dist: xenial
 language: ruby
-cache: bundler
-rvm:
-  - 2.6.1
-before_install: gem install bundler
+cache:
+  - bundler
+ directories:
+   - /home/travis/.rvm/
+before_install:
+    - gem update --system
+    - gem install bundler
+addons:
+  apt:
+    update: true
+    packages:
+      - pandoc
+      - gpp
+      - graphicsmagick