Additional error types

[joepie91]

Hi,

I started writing database-error a while ago, which includes a number of error types that this library doesn't detect yet:

• UndefinedColumnError
• EnumError
• InvalidTypeError (possibly covered by DataError? but that seems more generic)

I don't currently have the time to contribute a PR to add them here, unfortunately, but figured you might want to know about the existence of that library - the code and testcases in there might be useful :)