.travis.yml in access-2.2.0 vs .travis.yml in access-2.3.0.pre.rc1

- old
+ new

@@ -1,10 +1,12 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.0
-  - 2.1
-  - 2.2
-  - 2.3.0
+  - 2.3
+  - 2.4
+  - 2.5
+before_install:
+  - gem update --system
+
 script: "bundle exec rake test"
 notifications:
   slack: accessdevelopment:ROQuruk7tsHBNDHZ1kGoXvdl