build(deps): bump mkdocs from 1.1 to 1.2.3

build(deps): bump future from 0.18.2 to 0.18.3

build(deps): bump nltk from 3.4.5 to 3.6.6

build(deps): bump pygments from 2.5.2 to 2.15.0

build(deps): bump tornado from 6.0.4 to 6.3.2

build(deps): bump pymdown-extensions from 6.3 to 10.0