Fix copy pasta from previous commit, I should have read the 'with open'

setup.py

@@ -5,7 +5,7 @@
 with open('requirements.txt') as f:
     requires = f.read().splitlines()
 
-with open(path.join(this_directory, 'README.md'), encoding='utf-8') as f:
+with open('README.md', encoding='utf-8') as f:
     long_description = f.read()
 
 setup(