Broken link to Error struct in docs

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Above all else: do not describe your problem, **SHOW** your problem.

#### What version of the `csv` crate are you using?

https://docs.rs/csv/latest/csv/struct.Reader.html

#### Briefly describe the question, bug or feature request.

At docs.rs, there is a broken link on the Reader page (url above) in the text "For more details on the precise semantics of errors, see the [Error](https://docs.rs/csv/latest/csv/enum.Error.html) type."

Maybe the Error type was changed from an Enum to a Struct at some point. And the docs need to be updated.
So https://docs.rs/csv/latest/csv/enum.Error.html should be https://docs.rs/csv/latest/csv/struct.Error.html instead.

Thanks