.travis.yml in rspreadsheet-0.2.15 vs .travis.yml in rspreadsheet-0.3

@@ -1,14 +1,15 @@
 language: ruby
 cache: bundler
 rvm:
-  - 2.2.3
-  - 2.2.0
-  - 2.1.7
   - 2.0.0
-  - 1.9.3
+  - 2.1.10
+  - 2.2.6
+  - 2.3.3
+  - 2.4.0
 script: 'bundle exec rake'
 before_install:
+  - gem uninstall libxml-ruby
   - gem update bundler
 notifications:
   email:
     recipients:
       - [e-mail]
\ No newline at end of file