chore: Update roadmap with notes on cache paths. (DylanVann#589)

Author: DylanVann

docs/roadmap.md

@@ -3,7 +3,10 @@
 ## Add `onProgress` and `onComplete` to preload.
 
 -   [Add onProgress and onComplete to preload.](https://github.com/DylanVann/react-native-fast-image/pull/268)
--   Blocked by: [Consider switching to a different iOS image loading library.](https://github.com/DylanVann/react-native-fast-image/issues/13).
+-   Blocked by: [Consider switching to a different iOS image loading library.](https://github.com/DylanVann/react-native-fast-image/issues/13)
+-   Preload API should include returning the cache path of the images.
+-   Something like `.preload(images: {uri, ...otherOptions}[]): Promise<[{path: string}]>`
+-   Maybe something like: [Make it possible to obtain the cache path of an image.](https://github.com/DylanVann/react-native-fast-image/pull/351)
 
 ## Add `blurRadius` prop.