.travis.yml in rspreadsheet-0.4.2 vs .travis.yml in rspreadsheet-0.4.3

@@ -5,14 +5,19 @@
   - 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
+matrix:
+  include:
+  - rvm: 2.4.0
+    before_install:
+      - gem uninstall libxml-ruby
+      - sudo apt-get install libxml2
+      - gem update bundler
+
 notifications:
   email:
     recipients:
       - [e-mail]
     on_failure: change
-    on_success: never
\ No newline at end of file
+    on_success: never