Bump json from 2.10.1 to 2.10.2

Bumps [json](https://github.com/ruby/json) from 2.10.1 to 2.10.2.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.10.1...v2.10.2)

---
updated-dependencies:
- dependency-name: json
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -228,7 +228,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.10.1)
+    json (2.10.2)
     jwt (2.10.1)
       base64
     koala (3.6.0)