.travis.yml in rspreadsheet-0.4.4 vs .travis.yml in rspreadsheet-0.4.5

@@ -8,11 +8,12 @@
   - 2.4.0
 script: 'bundle exec rake'
 matrix:
   include:
   - rvm: 2.4.0
-    before_install:
+    xx_before_install:
       - gem uninstall libxml-ruby
+      - sudo apt-get install ruby-libxml
       - sudo apt-get install libxml2
       - gem update bundler
 
 notifications:
   email: