Update README.md

Ada-C15 · Aug 26, 2021 · 404aa2a · 404aa2a
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@@ -11,5 +11,4 @@ In this exercise you will implement, in Ruby, several Tree methods.
 
 ## Optionals
 
-- `delete(value)` - This method removes a node from the tree. Also add tests for the method. 
 - `bfs` - This method returns an array with the tree elements in a level-by-level order (see [Breadth-First traversal](https://www.cs.bu.edu/teaching/c/tree/breadth-first/))