Update roxmltree requirement from 0.15 to 0.18

[dependabot]

Updates the requirements on roxmltree to permit the latest version.

Changelog

Sourced from roxmltree's changelog.

[0.18.0] - 2023-02-04

Added

• StringStorage that exposes an internal string storage.
• Allocated strings are stored as Arc<str> and not String now.
• Node::text_storage
• Node::tail_storage
• Attribute::value_storage
• Node::range

Removed

• Node::position. Use Node::range instead.

Fixed

• Some methods return longer lifetimes now. Thanks to @​adamreichold
• Overly verbose Debug implementations. Thanks to @​adamreichold

[0.17.0] - 2023-01-06

Added

• Stored namespaces are deduplicated now, which can reduce memory usage on large files up to 10%. Thanks to @​adamreichold

Changed

• Node::namespaces returns an iterator and not a slice now.

Fixed

• Unclosed root element is an error now. Thanks to @​adamreichold

[0.16.0] - 2022-11-20

Added

• positions build feature.
• Node::position
• Attribute::position
• ParsingOptions::nodes_limit to limit the maximum number of nodes to parse.

Changed

• Peak memory usage reduces by up to 20% depending on an input. Thanks to @​adamreichold and @​tomjw64.
• Node::attributes returns an iterator and not a slice now.

Removed

• 4GB input limit.
• Do not store Node and Attribute end range in the original document.
• Do not store attribute value range in the original document.
• Node::range. Use position instead.
• Attribute::range. Use position instead.
• Attribute::value_range

... (truncated)

Commits

• 8f6f14b Version bump.
• c4d622f Store node's end position again.
• 3d33827 Use ref-counted owned strings.
• e817186 Expose 'input lifetime where it is the backing lifetime.
• 0b12673 Use consistent debug impls for the various iterators that avoid formatting th...
• b81ec71 Version bump.
• 0553f41 Detect unclosed root nodes.
• bf055e7 Fix-ups to the deduplication of namespaces.
• 3a490a5 Provide a named type for the iterator returned by Node::namespaces and expand...
• 192d45e Only allocate normalized namespace URI when they are uniquely new.
• Additional commits viewable in compare view

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