.travis.yml in dpla-map-4.0.0.0.pre.12 vs .travis.yml in dpla-map-4.0.0.0.pre.13

@@ -1,10 +1,15 @@
 language: ruby
 bundler_args: --without debug
+sudo: false
+before_install: gem install -v '~> 1.10' bundler
 script: "bundle exec rspec spec"
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.0
-  - 2.1.1
   - 2.1.3
+  - 2.1.6
+  - 2.1.8
+  - 2.2.4
+  - 2.3.0
+  - ruby-head