docs(readme): goldman sachs reads the am.gs.com fund data api (#80)

Author: daggerok

README.md

@@ -190,7 +190,7 @@ git diff --check
 | First Trust | ftportfolios.com official ETF list + fund summary, holdings, distribution and price-history export pages + SEC EDGAR N-PORT-P holdings fallback + Yahoo Finance history fallback | [First-Trust](https://github.com/daggerok/First-Trust) |
 | Franklin Templeton | franklintempleton.com ETF listings + product pages + SEC EDGAR N-PORT-P | [Franklin](https://github.com/daggerok/Franklin) |
 | Global X | globalxetfs.com Next.js catalog and fund pages + dated full-holdings CSV | [Global-X](https://github.com/daggerok/Global-X) |
-| Goldman Sachs | am.gs.com fund finder + detail pages + SEC EDGAR N-PORT-P | [Goldman-Sachs](https://github.com/daggerok/Goldman-Sachs) |
+| Goldman Sachs | am.gs.com fund data API (catalog, fund details, daily full holdings) + SEC EDGAR N-PORT-P holdings fallback | [Goldman-Sachs](https://github.com/daggerok/Goldman-Sachs) |
 | Invesco | invesco.com fund pages and sitemap + official Invesco fund API (monthly returns, NAV, AUM, yields, daily holdings, expense ratio) + SEC EDGAR N-PORT-P holdings fallback + Yahoo Finance history/dividends | [Invesco](https://github.com/daggerok/Invesco) |
 | iShares | iShares (BlackRock) product workbooks | [iShares](https://github.com/daggerok/iShares) |
 | JPMorgan | am.jpmorgan.com fund explorer + product-data JSON | [JPMorgan](https://github.com/daggerok/JPMorgan) |