Fix boolean test, incorrectly changed. Off-by-one errors are particularly ugly...

Fix boolean test, incorrectly changed. Off-by-one errors are particularly ugly with booleans ;) Fixes #77

setuptools/command/upload.py

@@ -122,7 +122,7 @@ class upload(Command):
         body = StringIO.StringIO()
         for key, value in data.items():
             # handle multiple entries for the same name
-            if isinstance(value, list):
+            if not isinstance(value, list):
                 value = [value]
             for value in value:
                 if type(value) is tuple: