Add images to README that show up in pypi.

README.md

@@ -22,7 +22,7 @@ More information about both methods are given in the specific class documentatio
 
 The [Kármán vortex street](https://en.wikipedia.org/wiki/K%C3%A1rm%C3%A1n_vortex_street) solved by a finite element discretization of the [weak form of the incompressible Navier-Stokes equations](https://en.wikipedia.org/wiki/Navier%E2%80%93Stokes_equations#Weak_form) using [FEniCS](https://fenicsproject.org/) and the three stage Radau IIA method.
 
-![Karman](https://github.com/JonasBreuling/scipy_dae/blob/main/data/img/von_Karman.gif)
+![Karman](https://raw.githubusercontent.com/JonasBreuling/scipy_dae/main/data/img/von_Karman.gif)
 
 ## Basic usage
 
@@ -79,7 +79,7 @@ ax.grid()
 plt.show()
 ```
 
-![Robertson](https://github.com/JonasBreuling/scipy_dae/blob/main/data/img/Robertson.png)
+![Robertson](https://raw.githubusercontent.com/JonasBreuling/scipy_dae/main/data/img/Robertson.png)
 
 ## Advanced usage