.travis.yml in aptly_cli-0.4.2 vs .travis.yml in aptly_cli-0.5.0

@@ -15,12 +15,13 @@
 
 after_script:
 - rake docker_show_logs
 
 rvm:
-- 2.1.10
-- 2.2.5
-- 2.3.1
+- 2.3.8
+- 2.4.5
+- 2.5.3
+- 2.6.1
 
 deploy:
   provider: rubygems
   api_key:
     secure: EKpsyP07VCbhH4Y/kF00ylB14R1iRekrmqcsC6No1Cf2dELwqeypQfwo3lLTZXhB0DjjgZSuXcnzw+QRTx+xZ6U7gsLrGDoKMd/irr+TBb2qyQhSBmjYuxHAWnRBtFdxWztsh77qi2SVDG7VIaJ94HnTTEjvaRhabsrOUI80MD8=