added long description to setup file

README.md

@@ -17,6 +17,7 @@ It even comes with an integrated Chapman Enskog analysis based on sympy!
 Common test scenarios can be set up quickly:
 ```python
 from lbmpy.scenarios import create_channel
+
 ch = create_channel(domain_size=(300,100, 100), force=1e-7, method="trt",
                     equilibrium_order=2, compressible=True,
                     relaxation_rates=[1.97, 1.6], optimization={'target': 'gpu'})

setup.py

@@ -62,6 +62,7 @@ setup(name='lbmpy',
       version=version,
       description='Code Generation for Lattice Boltzmann Methods',
       long_description=readme(),
+      long_description_content_type="text/markdown",
       author='Martin Bauer',
       license='AGPLv3',
       author_email='martin.bauer@fau.de',