Use a more recent version of Bundler

This is an attempt to fix bundle errors. https://travis-ci.org/aetrion/dnsimple-ruby/jobs/97228226
dnsimple · Dec 27, 2015 · aa6405c · aa6405c
1 parent 8cf9d02
commit aa6405c
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,9 @@
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.0
-  - 2.1
-  - 2.2
+- 1.9.3
+- 2.0
+- 2.1
+- 2.2
 env: COVERALL=1
+before_install:
+- gem install bundler