.travis.yml in tel_formatter-0.0.4 vs .travis.yml in tel_formatter-1.0.0

@@ -1,5 +1,6 @@
 language: ruby
 script: bundle exec rspec
 rvm:
-  - 2.1.0
-  - 2.0.0
+  - 2.6.2
+  - 2.5.5
+  - 2.4.6