docs(readme): add alternate sequential flow

README.md

@@ -354,8 +354,12 @@ const MyFavoriteBook = () => {
   const { isLoading: loadingProfile, data: profile } = useFetchye('http://example.com/api/profile');
 
   const profileHasBookId = !loadingProfile && profile?.body?.favoriteBookId;
-  const { isLoading: loadingBook, data: favoriteBook } = useFetchye(`http://example.com/api/books/${profile?.body?.favoriteBookId}`, {
+  const { isLoading: loadingBook, data: favoriteBook } = useFetchye('http://example.com/api/books', {
     defer: !profileHasBookId,
+    method: 'POST',
+    body: JSON.stringify({
+      bookId: profile?.body?.favoriteBookId,
+    }),
   });
 
   if (loadingProfile) {
@@ -382,6 +386,44 @@ const MyFavoriteBook = () => {
 };
 ```
 
+Alternatively, you can pass a function as the first parameter to useFetchye, if this function throws an exception the call will automatically be 'deferred' until the function does not throw.
+
+This only works if the sequential data is passed to the second call in the url.
+
+In this example, the function will throw `Cannot read properties of undefined` when trying to access 'favoriteBookId' in the non-existent body of the profile:
+
+```jsx
+import React from 'react';
+import { useFetchye } from 'fetchye';
+
+const MyFavoriteBook = () => {
+  const { isLoading: loadingProfile, data: profile } = useFetchye('http://example.com/api/profile');
+  const { isLoading: loadingBook, data: favoriteBook } = useFetchye(() => `http://example.com/api/books/${profile.body.favoriteBookId}`);
+
+  if (loadingProfile) {
+    return (<p>Loading Profile...</p>);
+  }
+  if (profile.status !== 200) {
+    return (<p>Oops!</p>);
+  }
+  if (loadingBook) {
+    return (<p>Loading Favourite Book...</p>);
+  }
+  if (favoriteBook.status !== 200) {
+    return (<p>Oops!</p>);
+  }
+
+  return (
+    favoriteBook.status === 200 && (
+      <>
+        <h1>My Favorite Book</h1>
+        <h2>{favoriteBook.body.title}</h2>
+      </>
+    )
+  );
+};
+```
+
 ### Refreshing
 
 ```jsx