.travis.yml in exercism-0.0.16 vs .travis.yml in exercism-0.0.17

@@ -1,7 +1,8 @@
 ---
 language: ruby
 rvm:
+  - 1.8.7
   - 1.9.2
   - 1.9.3
   - 2.0.0
   - rbx-19mode
 script: bundle exec rake