.travis.yml in async-rest-0.12.1 vs .travis.yml in async-rest-0.12.2

@@ -5,9 +5,10 @@
 matrix:
   include:
     - rvm: 2.4
     - rvm: 2.5
     - rvm: 2.6
+    - rvm: 2.7
     - rvm: 2.6
       env: COVERAGE=PartialSummary,Coveralls
     - rvm: jruby-head
       env: JRUBY_OPTS="--debug -X+O"
     - rvm: truffleruby