README.md: Update version table

We add the version of the used schema files to the
version table, in order to better inform potential
users. 

Fixes #326

Author: s-heppner

README.md

@@ -9,6 +9,7 @@ These are the currently implemented specifications:
 | Specification                         | Version                                                                                                                                                                        |
 |---------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | Part 1: Metamodel                     | [v3.0 (01001-3-0)](https://industrialdigitaltwin.org/wp-content/uploads/2023/06/IDTA-01001-3-0_SpecificationAssetAdministrationShell_Part1_Metamodel.pdf)                      |
+| Schemata (JSONSchema, XSD)            | [v3.0.8 (IDTA-01001-3-0-1_schemasV3.0.8)](https://github.com/admin-shell-io/aas-specs/releases/tag/IDTA-01001-3-0-1_schemasV3.0.8)                                             |
 | Part 2: API                           | [v3.0 (01002-3-0)](https://industrialdigitaltwin.org/en/wp-content/uploads/sites/2/2023/06/IDTA-01002-3-0_SpecificationAssetAdministrationShell_Part2_API_.pdf)                |
 | Part 3a: Data Specification IEC 61360 | [v3.0 (01003-a-3-0)](https://industrialdigitaltwin.org/wp-content/uploads/2023/04/IDTA-01003-a-3-0_SpecificationAssetAdministrationShell_Part3a_DataSpecification_IEC61360.pdf) |
 | Part 5: Package File Format (AASX)    | [v3.0 (01005-3-0)](https://industrialdigitaltwin.org/wp-content/uploads/2023/04/IDTA-01005-3-0_SpecificationAssetAdministrationShell_Part5_AASXPackageFileFormat.pdf)          |