Bump json-editor to 2.2.1

Author: xrmx

README.md

@@ -5,7 +5,7 @@
 ![Admin Json Editor](example/example.png)
 
 
-Application adds support for editing JSONField in Django Administration via https://github.com/jdorn/json-editor.
+Application adds support for editing JSONField in Django Administration via https://github.com/json-editor/json-editor.
 
 ## Quick start