.travis.yml in telegram-bot-ruby-0.14.0 vs .travis.yml in telegram-bot-ruby-0.15.0

@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - 2.6.5
-  - 2.7.0
+  - 2.6.6
+  - 2.7.2
 script:
   - bundle exec rubocop
   - bundle exec rspec