html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/185#issuecomment-412299013,https://api.github.com/repos/simonw/datasette/issues/185,412299013,MDEyOklzc3VlQ29tbWVudDQxMjI5OTAxMw==,9599,2018-08-11T20:14:54Z,2018-08-11T20:14:54Z,OWNER,"I've been worrying about how this one relates to #260 - I'd like to validate metadata (to help protect against people e.g. misspelling `license_url` and then being confused when their license isn't displayed properly), but this issue requests the ability to add arbitrary additional keys to the metadata structure.

I think the solution is to introduce a metadata key called `extra_metadata_keys` which allows you to specifically list the extra keys that you want to enable. Something like this:

```
{
    ""title"": ""My title"",
    ""source"": ""Source"",
    ""source_url"": ""https://www.example.com/"",
    ""release_date"": ""2018-04-01"",
    ""extra_metadata_keys"": [""release_date""]
}
```
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