Force Bundler 1.x

Author: f-mer

.travis.yml

@@ -1,7 +1,9 @@
 language: ruby
 sudo: false
 cache: bundler
-before_install: gem install bundler -v 1.11.2
+before_install:
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2'
 rvm:
   - 2.3.1
   - 2.4.0