to support OSX Catalina dropping 32-bit applications, I've removed usearch9 as a strict dependency. vsearch will be the default for all processing steps, including taxonomy assignment. Along these lines, I've dropped UTAX classifier as "default" in the hybrid taxonomy method.
dropping usearch, required addition of a few new dependencies: mafft, fasttree, and the python package pyfastx (for speed simplicity).
added support for PacBio CCS reads. Reads can be processed with amptk pacbio and then clustering with amptk pb-dada2
several bug fixes
fix embarrassing typos in v1.5.0 -- do not use v1.5.0 its broken.
apparently it does not work in python 3.8 -- investigating that for future release/support.
working on ONT (Oxford Nanopore) support as well -- stay tuned for this in near future.