.travis.yml in bitcoin-ruby-0.0.19 vs .travis.yml in bitcoin-ruby-0.0.20

@@ -1,10 +1,9 @@
 language: ruby
 rvm:
-  - 2.2.9
-  - 2.3.6
-  - 2.4.3
-  - 2.5.1
+  - 2.4.9
+  - 2.5.7
+  - 2.6.5
 script:
   - bundle exec rake build_libsecp256k1
   - bundle exec rake rspec
   - bundle exec rake coin_spec[dogecoin]