Test with Ruby 2.7, cache bundler in CI

aried3r · web-flow · commit 097675c7670e · 2020-02-06T12:22:11.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,8 @@
 language: ruby
+cache: bundler
 rvm:
-  - 2.3.4
+  - 2.3
+  - 2.7
 before_install:
   - gem update --system
   - gem install bundler
