.travis.yml in dry-effects-0.1.0.alpha vs .travis.yml in dry-effects-0.1.0.alpha2

@@ -5,9 +5,10 @@
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - ./cc-test-reporter before-build
 rvm:
+  - 2.4.6
   - 2.5.5
   - 2.6.3
   - truffleruby
 after_script:
   - "[ -d coverage ] && ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT"