Forked of dvdbng/tweetnacl-blake2b-js. Using 'var' instead of 'const'

The npm package @sisi/tweetnacl-blake2b receives a total of 68 weekly downloads. As such, @sisi/tweetnacl-blake2b popularity was classified as not popular.

We found that @sisi/tweetnacl-blake2b demonstrated a not healthy version release cadence and project activity. It has 1 open source maintainer collaborating on the project.