Update README.md

Author: XORxes-1

README.md

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-# Older (dynamic) Quadtree
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-This version of the Quadtree simulation has been compiled with JDK13.0.1 (11-24-2019)
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+# (older, dynamic) Quadtree
 My original implementaion of a Java-based Quadtree. This older implementation used Vectors to store objects meant for collision detection as a preliminary "test" version. The quadnodes were created in real-time when at least two objects were found in a single quadrant. This dynamic system of creating sub-quadrants as necessary using Vectors to store objects proved to be inefficient (in Java) and the Quadtree became overwhelmed in little time even when using a small number of moving objects. To determine whether the dynamic nature of the quadtree or the use of Vectors was the culprit (or possibly both) will require further investigation in this branch. My newest version of the Quadtree at this time of writing (11-30-2019) is static and uses LinkedLists to store objects.
 
 A "Sprite" class was used with this earlier version of Quadtree for testing. The Sprite class was simply an AABB with top left and bottom right corners defined by (x1,y1) and (x2,y2). The Sprite also had a boolean determining whether or not it was close to any other Sprites and the ability to paint itself to a "Graphics" object.