Black, removed six usage.

Author: jonathanslenders

pymux/__init__.py

@@ -1 +0,0 @@
-from __future__ import unicode_literals

pymux/__main__.py

@@ -1,8 +1,7 @@
 """
 Make sure `python -m pymux` works.
 """
-from __future__ import unicode_literals
 from .entry_points.run_pymux import run
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     run()