.travis.yml in lookup_by-0.10.7 vs .travis.yml in lookup_by-0.10.8

@@ -1,11 +1,12 @@
 language: ruby
 rvm:
   - 1.9.3-p551
   - 2.0.0
-  - 2.1.6
-  - 2.2.2
-  - rbx-2.5.2
+  - 2.1.8
+  - 2.2.4
+  - 2.3.0
+  - rbx-3.19
 services:
   - postgresql
 before_script:
   - psql -c 'create database lookup_by_test' -U postgres
 script: