Update README.

Author: colinc86

README.md

@@ -253,18 +253,14 @@ LaTeX(input)
 
 `LaTeXSwiftUI` caches its SVG responses from MathJax and the images rendered as a result of the view's environment. If you want to control the cache, then you can access the static `dataCache` and `imageCache` properties.
 
-The caches are managed automatically, but if, for example, you wanted to clear the cache manually you may do so.
-
 ```swift
 // Clear the SVG data cache.
-LaTeX.dataCache?.removeAll()
+LaTeX.dataCache.removeAllObjects()
 
 // Clear the rendered image cache.
-LaTeX.imageCache.removeAll()
+LaTeX.imageCache.removeAllObjects()
 ```
 
-`LaTeXSwiftUI` uses the [caching](https://github.com/kean/Nuke/tree/master/Sources/Nuke/Caching) components of the [Nuke](https://github.com/kean/Nuke) package.
-
 ### 🏃‍♀️ Preloading
 
 SVGs and images are rendered and cached on demand, but there may be situations where you want to preload the data so that there is minimal lag when the view appears.