.travis.yml in dbee-1.0.0.pre.alpha.3 vs .travis.yml in dbee-1.0.0

- old
+ new

@@ -2,11 +2,11 @@
   global:
     - CC_TEST_REPORTER_ID=e7db23dad7560a076e48357331b0362db3741b62dbdd537bc30de27fa9cab69b
 language: ruby
 rvm:
   # Build on the latest stable of all supported Rubies (https://www.ruby-lang.org/en/downloads/):
-  - 2.5.3
-  - 2.6.0
+  - 2.4.6
+  - 2.5.5
   - 2.6.3
 cache: bundler
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter