Request to extend possible date formats

[bouhass]

We have hit an issue recently using this library where an iso date was not recognised as valid as it wasnt in one of the 3 formats defined here:

https://github.com/graphql-compose/graphql-compose/blob/master/src/type/date.ts#L7-L9

The format we used was "yyyy-MM-ddTHH:mm:ss.SSSSSS"

Generally speaking we are wondering whether it would be possible to extend to include more date formats?

One idea could be to try and create a Date instance out of the string and see if its accepted to avoid having to list all the possible formats.