Bump json from 2.0.3 to 2.3.0

Bumps [json](https://github.com/flori/json) from 2.0.3 to 2.3.0.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.0.3...v2.3.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile

@@ -12,7 +12,7 @@ ruby RUBY_VERSION
 gem 'jekyll', '3.3.1'
 gem 'jekyll-swiss'
 gem 'jemoji'
-gem 'json', '2.0.3'
+gem 'json', '2.3.0'
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 gem 'minima', '~> 2.0'

Gemfile.lock

@@ -41,7 +41,7 @@ GEM
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0)
-    json (2.0.3)
+    json (2.3.0)
     kramdown (1.13.2)
     liquid (3.0.6)
     listen (3.0.8)
@@ -96,7 +96,7 @@ DEPENDENCIES
   jekyll-feed (~> 0.6)
   jekyll-swiss
   jemoji
-  json (= 2.0.3)
+  json (= 2.3.0)
   minima (~> 2.0)
   pry (= 0.11.3)
   rb-readline