Chore: fix wrong url into TypeScript definition file in README

[Shinyaigeek]

Motivation 🔥

Hi ! 👋

I noticed the link into TypeScript definitions in "From JavaScript" section is wrong. The relative path in README.md is resolved with branch prefix automatically, so blob/master/path is resolved to https://github.com/org/repo/blob/master/blob/master/path.

FYI: https://github.blog/2013-01-31-relative-links-in-markup-files/

I fixed this. In the first place, the rule of relative path of GitHub is difficult to understand, so I decided to specify it with an absolute path.

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[devongovett]

Thanks!