readme fix

setup.cfg

@@ -9,7 +9,8 @@ author = LasNQ – Uni Hamburg
 author-email = christian.darsow@physik.uni-hamburg.de
 license = GPL v3
 # url = http://
-long-description = file: README.md
+long_description = file: README.md
+long_description_content_type = text/markdown
 # Change if running only on Windows, Mac or Linux (comma-separated)
 platforms = any
 # Add here all kinds of additional classifiers as defined under