.travis.yml in ezid-client-1.6.0 vs .travis.yml in ezid-client-1.7.0

@@ -2,9 +2,8 @@
 language: ruby
 rvm:
   - 2.3.1
   - 2.2
   - 2.1
-  - 2.0.0
 cache:
   - bundler
 script: "bundle exec rake ci"