v1.6.0

fix: add missing field for autolink reference Michał Tomaszek (@mtweeman) (#22)

## what

Adding missing variable field to the autolink references.

why

is_alphanumeric field exists in autolink_references variable, but is not added in the github_repository_autolink_reference resource. Because of that, default provider's value is used (true) regardless of the value specified by the variable.