update readme with new demo

README.md

@@ -109,7 +109,7 @@ BibTeX:
 | [![Example 9](img/example9_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/9-tls_livox_demo.ipynb)   | [![Example 10](img/example10_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/10-uls_toyblocks_livox.ipynb)            |
 | [![Example 11](img/example11_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/11-als_toyblock_multi_scanner_livox.ipynb)   | [![Example 12](img/example12_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/12-multi_scanner_puck.ipynb)            |
 | [![Example 13](img/example13_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/13-interpolated_trajectory.ipynb)   | [![Example 14](img/example14_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/14-urban_mls_dynamic.ipynb) |
-| [![Example 15](img/example15_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/15-tls_tree_dynamic.ipynb) |  |
+| [![Example 15](img/example15_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/15-tls_tree_dynamic.ipynb) | [![Example 16](img/example16_thumbnail.png)](https://nbviewer.org/github/3dgeo-heidelberg/helios/blob/dev/example_notebooks/16-dyn_geom_swap.ipynb) | |