Adding redshift create table special syntax.

Python 3 fix.

Author: ls-aron-kyle

redshift_sqlalchemy/dialect.py

@@ -67,7 +67,7 @@ def post_create_table(self, table):
 
         sortkey = info.get('sortkey', None)
         if sortkey:
-            if isinstance(sortkey, basestring):
+            if isinstance(sortkey, str):
                 keys = (sortkey,)
             else:
                 keys = sortkey