.travis.yml in datadog-notifications-0.6.1 vs .travis.yml in datadog-notifications-0.6.2

@@ -1,7 +1,8 @@
 cache: bundler
 language: ruby
+before_install:
+  - gem install bundler
 rvm:
+  - 2.7
   - 2.6
   - 2.5
-  - 2.4
-  - 2.3