.travis.yml in devise-bootstrap-form-0.2.0 vs .travis.yml in devise-bootstrap-form-0.3.0

@@ -1,13 +1,15 @@
 language: ruby
 rvm:
   - 2.2.9
   - 2.3.6
   - 2.4.3
-  # - 2.5.0 The latest version is in the include clause and runs with danger.
+  - 2.5.0
 before_install:
-  - gem update --system
-  - gem install bundler --no-document
+  # https://docs.travis-ci.com/user/languages/ruby/#bundler-20
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem i rubygems-update -v '<3' && update_rubygems
+  - gem install bundler -v 1.17.3 --no-document
 
 matrix:
   include:
     # Bleeding edge
     - rvm: ruby-head