The link directive should be repeatable

[cschiewek]

The link directive should be repeatable. See https://www.apollographql.com/docs/federation/federated-types/federated-directives/#the-link-directive

cc: @kzlsakal

[cschiewek]

Would love to see a 0.4.1 release if/when this is merged.

[kzlsakal]

Thanks @cschiewek! Would you be able to add a test that verifies the repeatable behaviour?

[cschiewek]

@kzlsakal Would Absinthe.Federation.NotationTest be the appropriate module for that test? I don't see any other test that explicitly checking any of the federation directives.

[kzlsakal]

Thank you very much @cschiewek!

[cschiewek]

Thank you for the quick release @kzlsakal!