fix: changed read-back readme file to reflect previous changes

setup.py

@@ -17,7 +17,7 @@ MODULE = 'account_de_skr04'
 PREFIX = 'mds'
 
 # Get the long description from the README file
-with open(path.join(here, 'README.rst'), encoding='utf-8') as f:
+with open(path.join(here, 'README.md'), encoding='utf-8') as f:
     long_description = f.read()
 
 # tryton.cfg einlesen