Make BST accept both a key & a value, closes 49

Author: Ilias Tsangaris

CHANGELOG.md

@@ -3,13 +3,27 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased
 
+## 2.0.0 - TBD
+### Features
+N/A
+
+### Bugs
+N/A
+
+### Breaking changes
+- For a BST Node, renamed the numerical property `value` to more appropriate `key`. A
+new `value` property is added to provide the ability for each node to store any data
+(aka a value) in addition to the numerical identifier (aka a key).
+
 ## Released
 
 ## 1.0.0 - 2018-04-11
-### Added
+### Features
 - Implement Linked List
 – Implement BinarySearchTree
-### Changed
--N/A
-### Removed
--N/A
+
+### Bugs
+N/A
+
+### Breaking Changes
+N/A