.travis.yml in ffi-icu-0.2.0 vs .travis.yml in ffi-icu-0.3.0

@@ -1,7 +1,13 @@
+language: ruby
+os: linux
+dist: xenial
+
 rvm:
-  - 2.4.6
-  - 2.5.5
-  - 2.6.3
+  - 2.5
+  - 2.6
+  - 2.7
   - ruby-head
+
 before_script:
   - sudo apt-get install -y libicu-dev
+