Update implementations.md

Updated the description for Oxygen JSON Schema implementation 2019-09 and 2020-12

Author: octavianN

implementations.md

@@ -310,7 +310,7 @@ the utility, and decided on a case-by-case basis.
 -   [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. JSON Schema validation debugger: Step through the validation process and set breakpoints.*
 -   [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.*
--   [Oxygen JSON Schema Editor](https://www.oxygenxml.com/xml_developer/json_schema_editor.html) - *JSON Schema editor with a variety of editing features and helper views (Design/Text/Author). Support for validation and editing JSON Schema draft-4, draft-6, and draft-7, 2019-09, 2020-12. Validation and editing of JSON files based on JSON Schema.*
+-   [Oxygen JSON Schema Editor](https://www.oxygenxml.com/xml_developer/json_schema_editor.html) - *JSON Schema editor with a variety of editing features and helper views (Design/Text/Author). Support for validation and editing JSON Schema draft-4, draft-6, and draft-7, 2019-09 (partial), 2020-12 (partial). Validation and editing of JSON files based on JSON Schema.*
 -   [Perseid Modeler](https://www.datensen.com/data-modeling/perseid-modeler-for-json-schema.html) - *a modeling tool for JSON Schema and OpenAPI. Key features include: visual JSON schema creation using tree and ERD-like diagrams, support for JSON schema structures including operators and conditions, import of existing schemas from files, creation of detailed HTML reports, export to PDF, script generation, and more. Supported versions: draft 4, 6, 7, 2019-09 and 2020-12*
 -   [Stoplight Studio](https://stoplight.io/) - *JSON Schema IDE (text-based and GUI) with support for JSON/YAML linting, which can also be based on JSON Schema rules via Spectral. Support for draft-4, draft-6 and draft-7.*
 -   [Visual Studio Code](https://code.visualstudio.com/) - *Schema driven code completion, hovers and validation for editing JSON files (including schemas)*