docs: updated additional parameter allowed input

README.md

@@ -49,7 +49,7 @@ users = await cachedGetUsers(); // <-- This will be executed and cached
 ```
 
 You can pass an additional parameter `dependencyKeys` property which instructs the plugin about which keys to use to invalidate the cache records if necessary.  
-This property can be either an array of strings, a function that returns an array of strings or a function that returns a Promise fulfilled with an array of strings.  
+This property can be either a number, a string, an array of strings, a function that returns an array of strings or a function that returns a Promise fulfilled with an array of strings.  
 Both the function and the Promise will receive the result of the method on which the `cacheCandidate` operates.  
 In case of an async method, the promise will be fulfilled before passing the result to the `dependencyKeys` function.  
-The `dependencyKeys` function will be called only if the cache adapter correctly sets the value in the cache (i.e. the `.set` method is fulfilled).
+The `dependencyKeys` function will be called only if the cache adapter correctly sets the value in the cache (i.e. the `.set` method is fulfilled).