Remove whitespace from blank line.

Author: Cornelius Riemenschneider

xdist/scheduler/filescope.py

@@ -16,7 +16,7 @@ class LoadFileScheduling(LoadScopeScheduling):
 
     When created, ``numnodes`` defines how many nodes are expected to submit a
     collection. This is used to know when all nodes have finished collection.
-    
+
     This class behaves very much like LoadScopeScheduling, but with a file-level scope.
     """