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Changes:
* Radically improve README documentation.
* Add estimates to reprocess command. (80)
* Add support for "csv" format for supersearch and supersearchfacet. (88)
* Drop support for Python 3.7. (90)
* Add support for Python 3.12. (91)
* Add "raw" format for better debugging.
* Add ``_histogram`` support. (98)
* Add ``--denote-weekends`` to supersearchfacet. (54)
* Implement parallelization for fetch-data. (106)
* Implement ``--leftover-count`` and ``--no-leftover-count`` for supersearchfacet. (109)
* Fix user-agent to reflect crashstats-tools version. (121)
* Add support for nested aggs and cardinality. (102, 103)
* Move functions for Crash Stats API to libcrashstats library. (67)