.travis.yml in devise-security-0.11.0 vs .travis.yml in devise-security-0.11.1

@@ -2,13 +2,12 @@
 before_install: gem install bundler && bundler -v
 install: bundle install --jobs=3 --retry=3
 before_script: bundle install
 script: bundle exec rake
 rvm:
-  - 2.1.8
-  - 2.2.4
-  - 2.3.4
-  - 2.4.1
+  - 2.2.8
+  - 2.3.5
+  - 2.4.2
   - ruby-head
 matrix:
   allow_failures:
     - rvm: ruby-head