docs: update readme

Author: wraithgar

README.md

@@ -62,26 +62,12 @@ fetch('https://registry.npmjs.org/make-fetch-happen').then(res => {
 * Quite fast, really
 * Automatic HTTP-semantics-aware request retries
 * Cache-fallback automatic "offline mode"
-* Proxy support (http, https, socks, socks4, socks5)
 * Built-in request caching following full HTTP caching rules (`Cache-Control`, `ETag`, `304`s, cache fallback on error, etc).
 * Node.js Stream support
 * Transparent gzip and deflate support
 * [Subresource Integrity](https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity) support
-* Literally punches nazis
-* Built in DNS cache
-* (PENDING) Range request caching and resuming
-
-### Contributing
-
-The make-fetch-happen team enthusiastically welcomes contributions and project participation! There's a bunch of things you can do if you want to contribute! The [Contributor Guide](https://github.com/npm/cli/blob/latest/CONTRIBUTING.md) outlines the process for community interaction and contribution. Please don't hesitate to jump in if you'd like to, or even ask us questions if something isn't clear.
-
-All participants and maintainers in this project are expected to follow the [npm Code of Conduct](https://www.npmjs.com/policies/conduct), and just generally be excellent to each other.
-
-Please refer to the [Changelog](CHANGELOG.md) for project history details, too.
-
-Happy hacking!
-
-### API
+* Proxy support (http, https, socks, socks4, socks5. via [`@npmcli/agent`](https://npm.im/@npmcli/agent))
+* DNS cache (via ([`@npmcli/agent`](https://npm.im/@npmcli/agent))
 
 #### <a name="fetch"></a> `> fetch(uriOrRequest, [opts]) -> Promise<Response>`
 
@@ -126,11 +112,6 @@ The following options for `minipass-fetch` are used as-is:
 These other options are modified or augmented by make-fetch-happen:
 
 * headers - Default `User-Agent` set to make-fetch happen. `Connection` is set to `keep-alive` or `close` automatically depending on `opts.agent`.
-* agent
-  * If agent is null, an http or https Agent will be automatically used. By default, these will be `http.globalAgent` and `https.globalAgent`.
-  * If [`opts.proxy`](#opts-proxy) is provided and `opts.agent` is null, the agent will be set to an appropriate proxy-handling agent.
-  * If `opts.agent` is an object, it will be used as the request-pooling agent argument for this request.
-  * If `opts.agent` is `false`, it will be passed as-is to the underlying request library. This causes a new Agent to be spawned for every request.
 
 For more details, see [the documentation for `minipass-fetch` itself](https://github.com/npm/minipass-fetch#options).
 
@@ -150,6 +131,7 @@ make-fetch-happen augments the `minipass-fetch` API with additional features ava
 * [`opts.onRetry`](#opts-onretry) - a function called whenever a retry is attempted
 * [`opts.integrity`](#opts-integrity) - [Subresource Integrity](https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity) metadata.
 * [`opts.dns`](#opts-dns) - DNS cache options
+* [`opts.agent`](#opts-agent) - http/https/proxy/socks agent options.  See [`@npmcli/agent`](https://npm.im/@npmcli/agent) for more info.
 
 #### <a name="opts-cache-path"></a> `> opts.cachePath`
 
@@ -380,12 +362,3 @@ fetch('https://malicious-registry.org/make-fetch-happen/-/make-fetch-happen-1.0.
   integrity: 'sha1-o47j7zAYnedYFn1dF/fR9OV3z8Q='
 }) // Error: EINTEGRITY
 ```
-
-#### <a name="opts-dns"></a> `> opts.dns`
-
-An object that provides options for the built-in DNS cache. The following options are available:
-
-Note: Due to limitations in the current proxy agent implementation, users of proxies will not benefit from the DNS cache.
-
-* `ttl`: Milliseconds to keep cached DNS responses for. Defaults to `5 * 60 * 1000` (5 minutes)
-* `lookup`: A custom lookup function, see [`dns.lookup()`](https://nodejs.org/api/dns.html#dnslookuphostname-options-callback) for implementation details. Defaults to `require('dns').lookup`.