Merge pull request #111 from launchdarkly/eb/ch34550/ruby-2.6

add Ruby 2.6.2 to CI

Author: eli-darkly

.circleci/config.yml

@@ -9,6 +9,7 @@ workflows:
       - test-2.3
       - test-2.4
       - test-2.5
+      - test-2.6
       - test-jruby-9.2
 
 ruby-docker-template: &ruby-docker-template
@@ -57,6 +58,13 @@ jobs:
       - image: consul
       - image: redis
       - image: amazon/dynamodb-local
+  test-2.6:
+    <<: *ruby-docker-template
+    docker:
+      - image: circleci/ruby:2.6.2-stretch
+      - image: consul
+      - image: redis
+      - image: amazon/dynamodb-local
   test-jruby-9.2:
     <<: *ruby-docker-template
     docker: