Update bundler to latest

grzegorz-jakubiak · web-flow · commit d1e932a1401d · 2020-01-26T23:53:50.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,8 @@ services:
   - mongodb
 before_install:
   - gem update --system
-  - gem install bundler   
+  - gem install bundler
+  - bundle update --bundler
 rvm:
   - 2.3
   - 2.4
