.travis.yml in doit-0.3.2 vs .travis.yml in doit-0.3.6

@@ -1,11 +1,16 @@
 language: ruby
 sudo: false
 
+bundler_args: --without production
+script: "bundle exec rake test"
+
 rvm:
-  - 2.5.0
-  - 2.4.1
-  - 2.3.0
+  - 2.6.1
+#  - 2.5.1
+#  - 2.5.0
+#  - 2.4.1
+#  - 2.3.0  # tested; no longer in CI
 #  - 2.2.3  # tested; no longer in CI
 #  - 2.0.0  # tested; no longer in CI
 
 notifications:
   email: false