.travis.yml in seo_cache-0.7.0 vs .travis.yml in seo_cache-0.8.0

@@ -2,6 +2,6 @@
 sudo: false
 language: ruby
 cache: bundler
 rvm:
   - 2.5.1
-before_install: gem install bundler -v 2.0.1
+before_install: gem install bundler -v 1.16.1