.travis.yml in pair_see-0.1.5 vs .travis.yml in pair_see-0.1.6

@@ -1,7 +1,11 @@
 language: ruby
 rvm:
   - '2.4.1'
+  - '2.3.0'
+  - '2.2.0'
+  - '2.1.0'
+  - '1.9.3'
 addons:
   code_climate:
     repo_token: cdb26718880608c44fda7463511e0151140ade238d92cb1044892472da13ca48
 script: bundle exec rake
 notifications: