Merge pull request #25 from ra1028/dependabot/bundler/json-2.3.1

Bump json from 2.2.0 to 2.3.1

Author: ra1028

Gemfile.lock

@@ -66,7 +66,7 @@ GEM
       sassc (~> 2.1)
       sqlite3 (~> 1.3)
       xcinvoke (~> 0.3.0)
-    json (2.2.0)
+    json (2.3.1)
     liferaft (0.0.6)
     minitest (5.13.0)
     molinillo (0.6.6)