Field type and Definition type inconsistant in json schema

[Torben Keller]

In the readme, Definition.type refers to Data Type but in the json schema every string is allowed.

    "Definition": {
      "type": "object",
      "title": "Definition",
      "properties": {
       ...
        "type": {
          "type": "string",
          "description": "The logical data type."
        },

[jochenchrist]

@torbenkeller Thanks for reporting. Do you have time to create a Pull Request to resolve this issue?