Obey flake8 spacing laws

Author: sampsyo

audioread/__init__.py

@@ -59,9 +59,11 @@ def _mad_available():
     else:
         return True
 
-# A place to store available backends
+
+# A cache for the available backends.
 BACKENDS = []
 
+
 def available_backends(flush_cache=False):
     """Returns a list of backends that are available on this system.