.travis.yml in unsplash-2.1.0 vs .travis.yml in unsplash-3.0.0

@@ -1,7 +1,6 @@
 language: ruby
 rvm:
-  - 2.3.8
-  - 2.4.5
-  - 2.5.4
-  - 2.6.2
+  - 2.7.6
+  - 3.0.4
+  - 3.1.2
 before_install: gem install bundler