upsetly 0.1.1

• Fixed the license link in README.md so it remains valid in the CRAN source package.

upsetly 0.1.0

• Prepared the first CRAN release.
• Added strict validation for data, column names, display limits, dimensions, and HTML target identifiers.
• Excluded elements that do not belong to any supplied set from intersection counts.
• Escaped user-provided labels in HTML tooltips and safely encoded box_id in the widget JavaScript.
• Reduced runtime dependencies and added automated tests.