.travis.yml in vindetta-0.19.0 vs .travis.yml in vindetta-0.20.0

@@ -1,5 +1,5 @@
 sudo: false
 language: ruby
 rvm:
   - 2.4.1
-before_install: gem install bundler -v 1.14.6
+before_install: gem install bundler -v 1.16.1