.travis.yml in gem_bench-1.0.0 vs .travis.yml in gem_bench-1.0.1

@@ -1,5 +1,9 @@
 sudo: false
 language: ruby
 rvm:
+  - 2.0
+  - 2.1
+  - 2.2
+  - 2.3.3
   - 2.4.0
 before_install: gem install bundler -v 1.14.5