.travis.yml in fog-azure-rm-0.4.8 vs .travis.yml in fog-azure-rm-0.4.9

@@ -1,21 +1,23 @@
 language: ruby
 sudo: false
 
 before_install:
-  - gem install bundler
-  - gem update bundler
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2'
   - gem uninstall -aIx nokogiri -i /home/travis/.rvm/gems/ruby-2.4.1@global nokogiri
 
 script: bash ./rake-script.sh
 
 rvm:
   - 2.0.0
   - 2.1.0
   - 2.1.1
   - 2.1.5
-  - 2.2.0
-  - 2.3.0
+  - 2.2.10
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1
   - jruby-head
 
 matrix:
   fast_finish: true
   allow_failures: