Drop support for EOL Python 2.6

jedi/evaluate/stdlib.py

@@ -256,13 +256,7 @@ def collections_namedtuple(evaluator, obj, arguments):
     This has to be done by processing the namedtuple class template and
     evaluating the result.
 
-    .. note:: |jedi| only supports namedtuples on Python >2.6.
-
     """
-    # Namedtuples are not supported on Python 2.6
-    if not hasattr(collections, '_class_template'):
-        return NO_CONTEXTS
-
     # Process arguments
     # TODO here we only use one of the types, we should use all.
     name = list(_follow_param(evaluator, arguments, 0))[0].obj