Merge pull request #194 from bastelfreak/ruby27

Add Ruby 2.7 to test matrix

Author: rwz

.travis.yml

@@ -43,6 +43,9 @@ matrix:
   - rvm: 2.6
     gemfile: gemfiles/gemfile-2-3
     env: SKIP_ADAPTERS=gson,jr_jackson,nsjsonserialization
+  - rvm: 2.7
+    gemfile: gemfiles/gemfile-2-3
+    env: SKIP_ADAPTERS=gson,jr_jackson,nsjsonserialization
   - rvm: ruby-head
     gemfile: gemfiles/gemfile-2-3
     env: SKIP_ADAPTERS=gson,jr_jackson,nsjsonserialization
@@ -51,4 +54,4 @@ matrix:
     env: SKIP_ADAPTERS=oj,yajl,jr_jackson,nsjsonserialization
   - rvm: jruby-head
     gemfile: gemfiles/gemfile-2-jruby
-    env: SKIP_ADAPTERS=oj,yajl,jr_jackson,nsjsonserialization
+    env: SKIP_ADAPTERS=oj,yajl,jr_jackson,nsjsonserialization