JSONSchema Draft 7 array Tuple Validation unsupported? Schema.from_dict() raise exception about singer-python

[modularTaco]

I think jsonschema draft7 is fully unsupported, as of

singer-python/setup.py

Line 14 in 66688d7

'jsonschema==2.6.0',

and the jsonschema lib in version 2.6.0 only includes the Draft3Validator and Draft4Validator, no validators for draft 5, 6 or 7.

So if there is a specific reason for this jsonschema version, there might be other screws that need to be adjusted for a full draft 7 support.

But i started experimenting with singer-python yesterday, so i may be wrong.