Fix broken autopep8 Pipeline (#420)

Co-authored-by: Valentin Seitz <valentin.seitz@tum.de>

Author: valentin-seitz

perpendicular-flap/solid-fenics/solid.py

@@ -1,7 +1,7 @@
 """
 This source code is based on https://gitlab.enpc.fr/jeremy.bleyer/comet-fenics/-/blob/master/examples/elastodynamics/demo_elastodynamics.py.rst
 
-See also: 
+See also:
     Jeremy Bleyer. (2018). Numerical Tours of Computational Mechanics with FEniCS. Zenodo. https://doi.org/10.5281/zenodo.1287832
 """