v1.3.0

Changes from v1.2.3:

• Add fill_down and fill_up window functions.
• Add boolean drop option to derive() verb to drop original columns and retain derived columns only.
• Add support for pre-filtered Apache Arrow tables.
• Add flexible column selection for Apache Arrow import.
• Add TypeScript types to build output, compiled from JSDoc comments. (thanks @dworthen!)
• Fix internal column name handling to properly order integer-named columns.
• Fix op.match to use the proper string match method.
• Fix JSDoc types to use object, not Object.