travis.yml: update Ruby.

MikeMcQuaid · web-flow · commit db628815a74b · 2019-12-04T16:54:56.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -2,8 +2,7 @@ language: node_js
 node_js:
   - 6
 before_install:
-  - gem install bundler -v 1.16.1
-  - rvm install 2.4.3
+  - rvm install 2.6.5
   - npm install -g npm@5
 install:
   - npm install
