Pull request #94: Added mention of supported JSON schema drafts.

Merge in ITB/json-validator from feature/engine-replace to master

* commit 'ebad3d155ed91b116358b463c771f7825fe55563':
  Added mention of supported JSON schema drafts.

Author: costas80

README.md

@@ -10,7 +10,7 @@
 
 # JSON validator
 
-The **JSON validator** is a web application to validate JSON data against [JSON Schema](https://json-schema.org/).
+The **JSON validator** is a web application to validate JSON data against [JSON Schema](https://json-schema.org/) (Core Draft v4, v6, v7, v2019-09 and v2020-12).
 The application provides a fully reusable core that requires only configuration to determine the supported specifications,
 configured validation types and other validator customisations. The web application allows validation via: