fix: typescript config only available in CLI

[michielmetcake]

The option typescript: is not working in the svgr config.

Summary

This is a update in the docs to explain the API Override to be available in CLI only.

How to reproduce

In package JSON:

Non working example:

"script": {"build:svg": "svgr icons icons},
 "svgr": {"typescript": true }

Working example:

"script": {"build:svg": "svgr icons icons --typescript},

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[codecov]

Codecov Report

Merging #437 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #437   +/-   ##
=======================================
  Coverage   86.53%   86.53%           
=======================================
  Files          31       31           
  Lines         557      557           
  Branches      153      153           
=======================================
  Hits          482      482           
  Misses         60       60           
  Partials       15       15           

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[gregberge]

It is not true. TypeScript option is required in CLI to correctly generate index and extension. So it is a bug in fact.