.travis.yml in smart_engine-0.2.0 vs .travis.yml in smart_engine-0.3.0

@@ -1,25 +1,20 @@
 ---
 language: ruby
 cache: bundler
 before_install: gem install bundler -v 2.1.2
+os: linux
 script:
 - bundle exec rake rubocop
 - bundle exec rake rspec
 jobs:
   fast_finish: true
   include:
   - rvm: 2.4.9
-    os: [linux, osx]
   - rvm: 2.5.7
-    os: [linux, osx]
   - rvm: 2.6.5
-    os: [linux, osx]
   - rvm: 2.7.0
-    os: [linux, osx]
   - rvm: ruby-head
-    os: [linux, osx]
   - rvm: jruby-head
-    os: [linux, osx]
   allow_failures:
   - rvm: ruby-head
   - rvm: jruby-head