Merge pull request #25 from cloudfoundry-samples/dependabot/bundler/service_broker/json-2.3.0

Bump json from 2.1.0 to 2.3.0 in /service_broker

Author: elenasharma

service_broker/Gemfile.lock

@@ -9,7 +9,7 @@ GEM
     faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
     hashdiff (0.3.6)
-    json (2.1.0)
+    json (2.3.0)
     metaclass (0.0.4)
     method_source (0.9.0)
     minitest (5.10.3)