.travis.yml in search_lingo-2.0.0 vs .travis.yml in search_lingo-3.0.0.pre1

@@ -1,5 +1,7 @@
 language: ruby
 rvm:
-  - 2.3.8
-  - 2.4.5
-  - 2.5.3
+  - "2.7"
+  - "3.0"
+  - "3.1"
+before_install:
+  - gem install bundler