.travis.yml in bonnie_bundler-2.2.3 vs .travis.yml in bonnie_bundler-2.2.4

@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - "2.3.5"
+  - "2.3.7"
 services: mongodb
 script:
   - bundle exec bundle-audit check --update
   - bundle exec rake
 notifications: