.travis.yml in http-protocol-0.17.0 vs .travis.yml in http-protocol-0.17.1

@@ -2,10 +2,9 @@
 dist: xenial
 cache: bundler
 
 matrix:
   include:
-    - rvm: 2.3
     - rvm: 2.4
     - rvm: 2.5
     - rvm: 2.6
     - rvm: 2.6
       env: COVERAGE=PartialSummary,Coveralls