Still have to install bundler version

kpaulisse · kpaulisse · commit ce5d134dcc9f · 2017-11-13T12:14:11.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,9 @@ language: ruby
 install: true
 script: "script/cibuild"
 
+before_install:
+  - gem install bundler -v 1.15.4
+
 matrix:
   include:
     # Build with latest ruby
