.travis.yml in bitcoin-ruby-0.0.18 vs .travis.yml in bitcoin-ruby-0.0.19

@@ -1,6 +1,10 @@
 language: ruby
 rvm:
   - 2.2.9
   - 2.3.6
   - 2.4.3
-  - 2.5.0
+  - 2.5.1
+script:
+  - bundle exec rake build_libsecp256k1
+  - bundle exec rake rspec
+  - bundle exec rake coin_spec[dogecoin]