fix(doc): fix link to proxy library (#636)

README.md

@@ -294,7 +294,7 @@ same major line. Should you need to upgrade to a new major, use an explicit
   empty password, explicitly set `COREPACK_NPM_PASSWORD` to an empty string.
 
 - `HTTP_PROXY`, `HTTPS_PROXY`, and `NO_PROXY` are supported through
-  [`node-proxy-agent`](https://github.com/TooTallNate/node-proxy-agent).
+  [`proxy-from-env`](https://github.com/Rob--W/proxy-from-env).
 
 - `COREPACK_INTEGRITY_KEYS` can be set to an empty string or `0` to
   instruct Corepack to skip integrity checks, or to a JSON string containing