.travis.yml in mini_kraken-0.1.06 vs .travis.yml in mini_kraken-0.1.07

@@ -1,7 +1,11 @@
 ---
 sudo: false
 language: ruby
 cache: bundler
 rvm:
-  - 2.6.3
+  - 2.7.1
+  - 2.6.6
+  - 2.5.8
+  - 2.4.10
+  - jruby-head
 before_install: gem install bundler -v 2.0.2