fix typo

README.md

@@ -30,6 +30,6 @@ Defines a `GameOfLifeGrid` component that renders the game of life (with several
 and a `FramesPerSecond` component which shows how many frames per seconds are being rendered (which
 depends on the monitor frame rate).
 
-This is stitched together using a `use_animation_frame()` hook returns a `frame_id` that can be used
+This is stitched together using a `use_animation_frame()` hook that returns a `frame_id` which can be used
 to trigger `use_effect` calls to render each frame (for the grid, and frames per second).  Also returns
 `frames_running`, which can be set false or true to stop or start the frames.