.travis.yml in http-form_data-2.0.0.pre2 vs .travis.yml in http-form_data-2.0.0

@@ -1,8 +1,10 @@
 language: ruby
 sudo: false
 
+cache: bundler
+
 before_install:
   - gem update --system
   - gem --version
   - gem install bundler --no-rdoc --no-ri
   - bundle --version
@@ -13,12 +15,10 @@
 
 env: JRUBY_OPTS="$JRUBY_OPTS --debug"
 
 rvm:
   # Include JRuby first because it takes the longest
-  - jruby-9.1.8.0
-  - 2.0.0
-  - 2.1
+  - jruby-9.1.13.0
   - 2.2
   - 2.3.4
   - 2.4.1
 
 matrix: