Remove trailing whitespaces

update

src/wrapt/decorators.py

@@ -255,7 +255,7 @@ def decorator(wrapper=None, enabled=None, adapter=None):
                     # we need to first check that use of the decorator
                     # hadn't been disabled by a simple boolean. If it was,
                     # the target function to be wrapped is returned instead.
-                    
+ 
                     _enabled = enabled
                     if type(_enabled) is bool:
                         if not _enabled:

src/wrapt/importer.py

@@ -9,7 +9,7 @@ import threading
 PY2 = sys.version_info[0] == 2
 PY3 = sys.version_info[0] == 3
 
-if PY3: 
+if PY3:
     import importlib
     string_types = str,
 else:

src/wrapt/wrappers.py

@@ -418,7 +418,7 @@ class CallableObjectProxy(ObjectProxy):
 class _FunctionWrapperBase(ObjectProxy):
 
     __slots__ = ('_self_instance', '_self_wrapper', '_self_enabled',
-            '_self_binding', '_self_parent') 
+            '_self_binding', '_self_parent')
 
     def __init__(self, wrapped, instance, wrapper, enabled=None,
             binding='function', parent=None):