.travis.yml in conoha-0.9.7 vs .travis.yml in conoha-0.9.8

@@ -1,8 +1,5 @@
 language: ruby
 rvm:
-  - 2.3.0
-  - 2.3.1
-  - 2.3.2
   - 2.3.3
   - 2.4.0
-before_install: gem install bundler -v 1.13.6
+before_install: gem install bundler -v 1.13.7