.travis.yml in timed_lru-0.3.2 vs .travis.yml in timed_lru-0.4.0

@@ -1,8 +1,8 @@
 language: ruby
-script: bundle exec rake coverage
+before_install:
+  - gem install bundler
 rvm:
-  - 2.2
-  - 2.3
   - 2.4
-gemfile:
-  - Gemfile
+  - 2.5
+  - 2.6
+cache: bundler