Merge pull request #319 from rubygems/dependabot/bundler/json-2.9.1

Gemfile.lock

@@ -162,7 +162,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.9.0)
+    json (2.9.1)
     jwt (2.7.1)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)