.travis.yml in dyndnsd-2.0.0 vs .travis.yml in dyndnsd-2.1.0

@@ -1,8 +1,12 @@
 ---
-sudo: false
+os: linux
 language: ruby
 rvm:
-  - 2.6
-  - 2.5
-  - 2.4
-  - 2.3
+- 2.7
+- 2.6
+- 2.5
+- 2.4
+- 2.3
+
+script:
+- bundle exec rake travis