v5.20.1

Changes from v5.20.0:

monorepo

• Update dependencies.

vega-dataflow

• Fix memory leak on dataflow detach. (thanks @krisdages!)

vega-transforms

• Fix memory leak on dataflow detach. (thanks @krisdages!)

vega-typings

• Update typing comments for bindings and projections to fill-in missing Vega-Lite documentation.