ConfigTree can't have a value

[blvp]

For example,

>>> from pyhocon import ConfigFactory
>>> ConfigFactory.parse_string("""
... a = aaa
... a.b = bbb
... a.c = ccc
... """)
ConfigTree([('a', ConfigTree([('b', u'bbb'), ('c', u'ccc')]))])

pip freeze | grep pyhocon
pyhocon==0.3.44