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* ``taxit update_taxids --taxid-column`` allows updating of any tax_id column [GH-84]
* ``taxit update_taxids --ignore-unknowns`` allows unknown tax_ids to remain in final output [GH-84]
* ``taxit new_database`` adds ncbi as the only entry in the source table [GH-91]
* ``taxit new_database`` adds a ranks table with all ranks appearing in the nodes table [GH-86]
* Any flavor of database can used with Taxtastic. But only sqlite and Postgres have been tested.
* Numerous new features and performance improvements.