.travis.yml in async-rest-0.8.0 vs .travis.yml in async-rest-0.8.1

@@ -2,10 +2,9 @@
 dist: xenial
 cache: bundler
 
 matrix:
   include:
-    - rvm: 2.3
     - rvm: 2.4
     - rvm: 2.5
     - rvm: 2.6
     - rvm: jruby-head
       env: JRUBY_OPTS="--debug -X+O"