v1.8.1

use byte string for KFX books

v1.8.0

search lemma in multiple threads

v1.7.1

always update EXTH header

v1.7.0

fetch ASIN from Amazon and update MOBI EXTF header

v1.6.1

remove lemmatize button

extract zip file in job thread to avoid blocking calibre main thread
add 454 lemmas

v1.6.0

- only match words have at least three characters

- lemmatize words

v1.5.1

delete redundant return values

v1.5.0

generate correct format ASIN, remove duplicate lemmas, add more lemmas

v1.4.0

support kfx

v1.3.0

get the correct offset for azw3 books