.travis.yml in rubydns-2.0.0 vs .travis.yml in rubydns-2.0.1

@@ -1,10 +1,12 @@
 language: ruby
 sudo: false
 rvm:
-  - 2.2.6
-  - 2.3.0
-  - 2.4.0
+  - 2.0
+  - 2.1
+  - 2.2
+  - 2.3
+  - 2.4
   - ruby-head
 addons:
   apt:
     packages:
     - bind9