fix: broken link

README.md

@@ -17,7 +17,7 @@ This library implements following features:
 |Link | Description | Image |
 |---|---|---|
 | [Bikes](http://piercus.github.io/kalman-filter) | 4D Constant Acceleration boxes | ![Kalman Filter Bike Gif](./demo/demo_light.gif) |
-| [Bouncing Ball](http://piercus.github.io/kalman-filter/bouncing.html) | 2D constant acceleration with bounces | ![3x3 rotation matrix](./demo/bouncing-ball.gif) |
+| [Bouncing Ball](http://piercus.github.io/kalman-filter/bouncing-ball.html) | 2D constant acceleration with bounces | ![3x3 rotation matrix](./demo/bouncing-ball.gif) |
 | [Sinusoidale Extended Kalman-Filter](https://observablehq.com/d/a033acc0859cc0de) | 1D Extended KF Sinus | ![Kalman Filter Sin Extended](./demo/Sinus-EKF.png) |
 | [Code pen GPS Data smoothing with constant speed](https://codepen.io/piercus/pen/wvoqPww) | 2D constant speed | ![Kalman Filter GPS](./demo/gps.png) |
 | [Partial Observation](https://github.com/piercus/kalman-filter/issues/34) | 1D / 2 sensor with missing values | ![partial](./demo/partial.png) |