Update README.md

Author: cebe

README.md

@@ -1,8 +1,13 @@
 # php-openapi
 
-Read and write [OpenAPI](https://www.openapis.org/) 3.0.x YAML and JSON files and make the content accessible in PHP objects.
+Read and write [OpenAPI](https://www.openapis.org/) 3.x YAML and JSON files and make the content accessible in PHP objects.
 
-It also provides a CLI tool for validating and converting OpenAPI 3.0.x Description files.
+It also provides a CLI tool for validating and converting OpenAPI 3.x Description files.
+
+Supported OpenAPI versions:
+
+- 3.0.x
+- 3.1.x
 
 [![Latest Stable Version](https://poser.pugx.org/cebe/php-openapi/v/stable)](https://packagist.org/packages/cebe/php-openapi)
 [![Total Downloads](https://poser.pugx.org/cebe/php-openapi/downloads)](https://packagist.org/packages/cebe/php-openapi)
@@ -212,7 +217,7 @@ $openapi->resolveReferences(
 
 The library provides simple validation operations, that check basic OpenAPI spec requirements.
 This is the same as "structural errors found while reading the API Description file" from the CLI tool.
-This validation does not include checking against the OpenAPI v3.0 JSON schema, this is only implemented in the CLI.
+This validation does not include checking against the OpenAPI v3.0/v3.1 JSON schemas, this is only implemented in the CLI.
 
 ```
 // return `true` in case no errors have been found, `false` in case of errors.
@@ -225,48 +230,6 @@ $errors = $openapi->getErrors();
 > but the list of errors given may not be complete. Also a passing validation does not necessarily indicate a completely
 > valid spec.
 
-
-## Completeness
-
-This library is currently work in progress, the following list tracks completeness:
-
-- [x] read OpenAPI 3.0 JSON
-- [x] read OpenAPI 3.0 YAML
-- [ ] OpenAPI 3.0 Schema
-  - [x] OpenAPI Object
-  - [x] Info Object
-  - [x] Contact Object
-  - [x] License Object
-  - [x] Server Object
-  - [x] Server Variable Object
-  - [x] Components Object
-  - [x] Paths Object
-  - [x] Path Item Object
-  - [x] Operation Object
-  - [x] External Documentation Object
-  - [x] Parameter Object
-  - [x] Request Body Object
-  - [x] Media Type Object
-  - [x] Encoding Object
-  - [x] Responses Object
-  - [x] Response Object
-  - [x] Callback Object
-  - [x] Example Object
-  - [x] Link Object
-    - [ ] [Runtime Expressions](https://github.com/OAI/OpenAPI-Specification/blob/3.0.2/versions/3.0.2.md#runtime-expressions)
-  - [x] Header Object
-  - [x] Tag Object
-  - [x] Reference Object
-  - [x] Schema Object
-    - [x] load/read
-    - [ ] validation
-  - [x] Discriminator Object
-  - [x] XML Object
-  - [x] Security Scheme Object
-  - [x] OAuth Flows Object
-  - [x] OAuth Flow Object
-  - [x] Security Requirement Object
-
 # Support
 
 **Need help with your API project?**