Merge branch 'result-history' of https://github.com/testing-library/react-hooks-testing-library into result-history

Author: mpeyper

docs/api-reference.md

@@ -63,13 +63,17 @@ The `renderHook` function returns an object that has the following properties:
 
 ```js
 {
+  all: Array<any>
   current: any,
   error: Error
 }
 ```
 
-The `current` value or the `result` will reflect whatever is returned from the `callback` passed to
-`renderHook`. Any thrown values will be reflected in the `error` value of the `result`.
+The `current` value or the `result` will reflect the latest of whatever is returned from the
+`callback` passed to `renderHook`. Any thrown values from the latest call will be reflected in the
+`error` value of the `result`. The `all` value is an array containing all the returns (including the
+most recent) from the callback. These could be `result` or an `error` depending on what the callback
+returned at the time.
 
 ### `rerender`