.travis.yml in leaflet-rails-0.7.7 vs .travis.yml in leaflet-rails-1.0.0.pre.rc1

@@ -1,7 +1,8 @@
 sudo: false
 language: ruby
+cache: bundler
 rvm:
   - ruby-head
   - jruby-head
   - 2.0.0
   - 2.1.8
@@ -9,7 +10,11 @@
   - 2.3.0
 matrix:
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
+before_install:
+  - gem update --system
+  - gem install bundler
+  - gem --version
 notifications:
   email: false