fixing typo in README (#279)

Author: zdaq12

README.md

@@ -32,7 +32,7 @@ import PyPartMC
 
 #### Jupyter notebooks with examples 
 
-- Urban plum scenario demo (as in [PartMC](https://github.com/compdyn/partmc/tree/master/scenarios/1_urban_plume)):    
+- Urban plume scenario demo (as in [PartMC](https://github.com/compdyn/partmc/tree/master/scenarios/1_urban_plume)):
 [![nbviewer](https://raw.githubusercontent.com/jupyter/design/master/logos/Badges/nbviewer_badge.svg)](https://nbviewer.jupyter.org/github/open-atmos/PyPartMC/blob/main/examples/particle_simulation.ipynb)
 [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/open-atmos/PyPartMC/blob/main/examples/particle_simulation.ipynb)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/open-atmos/PyPartMC.git/main?urlpath=lab/tree/examples/particle_simulation.ipynb)