Added Hackolade Studio JSON Schema editor

Added Hackolade Studio to the list of Editors, since it supports all recent specifications of JSON Schema.  See https://hackolade.com/help/JSONSchemaEditor.html for more information

Author: pdesmarets

implementations.md

@@ -253,6 +253,7 @@ _None currently support draft-06 or later._
 
 -   [Altova XMLSpy 2019r3](https://www.altova.com/xmlspy-xml-editor#json_schema) - *Graphical JSON Schema editor for draft-06 and draft-7, as well as validation of JSON files based on JSON Schema*
 -   [Dashjoin JSON Schema editor](https://dashjoin.github.io/#/schema) - *Graphical online JSON Schema editor for draft-06 (minus oneOf, anyOf, allOf, not). The generated schema can be tested immediately via a form that is driven by it.*
+-   [Hackolade Studio](https://hackolade.com/help/JSONSchemaEditor.html) - *Visual JSON Schema editor for draft-04, draft-06, draft-07, 2019-09, 2020-12, as well as data modeling tool for NoSQL databases, storage formats, REST APIs, and JSON in RDBMS.  Also converts to and from: different draft specifications, DDL, XSD, Swagger, OpenAPI, YAML, Avro, Parquet, Protobuf, and most of the NoSQL script syntaxes.  Includes a GUI for Entity-Relationship Diagrams and a Command-Line Interface.*
 -   [JSONBuddy](https://www.json-buddy.com/) - *Text and grid-style JSON editor and validator with JSON schema analyzer, context sensitive entry-helpers and sample data generation based on JSON schema. Support for draft-4, draft-6, draft-7 and 2019-09.*
 -   [JSONEditor Online](https://jsoneditoronline.org/) - *View, edit, format, and validate JSON online* Support draft-4, draft-6, and draft-7.
 -   [Liquid JSON Schema Editor](https://www.liquid-technologies.com/json-schema-editor) - *Graphical JSON Schema editor for draft-04, draft-06, draft-07 and 2019-09, with split source code and grphical editing. Includes validation of JSON files based on JSON Schema, JSON Sample Generator and JSON Schema Documentation Generator.*