.travis.yml in bundler-advise-1.1.0 vs .travis.yml in bundler-advise-1.1.1

@@ -1,4 +1,10 @@
 language: ruby
 rvm:
-  - 2.2.4
-before_install: gem install bundler -v 1.10.6
+  - 2.1.10
+  - 2.2.5
+  - 2.3.1
+before_install:
+  - gem install bundler -v 1.11.2
+install:
+  - bundle install --jobs=3 --retry=3 # do not use --deployment and freeze it
+