Update travis to update bundler gem in attempt to work around build issues with 2.5.1.

gkellogg · gkellogg · commit 68eccf960a3d · 2018-04-02T14:14:10.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,9 @@
 language: ruby
 bundler_args: --without debug
 script: "bundle exec rspec spec"
-before_install: "gem update --system"
+before_install:
+  - "gem update --system"
+  - "gem update bundler"
 env:
   - CI=true
 rvm:
