[BED-336] refactored to add support for error kind · redsift/spf@25de4c0

undefined: DNSError

undefined: ValidationError

undefined: ValidationError

undefined: ValidationError

undefined: ValidationError

cannot use &token{…} (value of type *token) as type SpfErrorKind in struct literal

cannot use SpfError{…} (value of type SpfError) as type *token in struct literal

cannot use &token{…} (value of type *token) as type SpfErrorKind in struct literal

cannot use ErrLoopDetected (variable of type error) as type *token in struct literal

too few values in SpfError{…}

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