.travis.yml in systemcall-1.0.1 vs .travis.yml in systemcall-1.0.2

@@ -1,10 +1,9 @@
----
 sudo: false
 language: ruby
-cache: bundler
 rvm:
-  - 2.3.8
-  - 2.4.5
-  - 2.5.3
-  - 2.6.1
+ - '2.3.8'
+ - '2.4.5'
+ - '2.5.3'
+ - '2.6.1'
 before_install: gem install bundler -v 2.0.1
+script: bundle exec rspec