feat: remove node-fetch in favor of global (#580)

BREAKING CHANGE: remove `node-fetch` in favor of global

Author: styfle

README.md

@@ -10,8 +10,7 @@ to interact with [GitHub’s REST API](https://developer.github.com/v3/) and
 [GitHub’s GraphQL API](https://developer.github.com/v4/guides/forming-calls/#the-graphql-endpoint).
 
 It uses [`@octokit/endpoint`](https://github.com/octokit/endpoint.js) to parse
-the passed options and sends the request using [fetch](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API)
-([node-fetch](https://github.com/bitinn/node-fetch) when the runtime has no native `fetch` API).
+the passed options and sends the request using [fetch](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API). You can pass a custom `fetch` function using the `options.request.fetch` option, see below.
 
 <!-- update table of contents by running `npx markdown-toc README.md -i` -->
 
@@ -319,7 +318,7 @@ const { data: app } = await requestWithAuth(
       Function
     </td>
     <td>
-     Custom replacement for <a href="https://github.com/bitinn/node-fetch">built-in fetch method</a>. Useful for testing or request hooks.
+     Custom replacement for <a href="https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API">fetch</a>. Useful for testing or request hooks.
     </td>
   </tr>
   <tr>
@@ -354,17 +353,6 @@ const { data: app } = await requestWithAuth(
       Used for internal logging. Defaults to <a href="https://developer.mozilla.org/en-US/docs/Web/API/console"><code>console</code></a>.
     </td>
   </tr>
-  <tr>
-    <th align=left>
-      <code>options.request.timeout</code>
-    </th>
-    <td>
-      Number
-    </td>
-    <td>
-     Node only. Request/response timeout in ms, it resets on redirect. 0 to disable (OS limit applies). <a href="#options-request-signal">options.request.signal</a> is recommended instead.
-    </td>
-  </tr>
 </table>
 
 All other options except `options.request.*` will be passed depending on the `method` and `url` options.