Resolve Python 3 problem with StateDict.items() (Fixed #81)
Resolve Python 3 problem with StateDict.items() (Fixed #81)

- items() method for dict returns list on Py2, but dict_item on Py3

ibell/coolprop,ibell/coolprop,CoolProp/CoolProp-museum,CoolProp/CoolProp-museum,CoolProp/CoolProp-museum,ibell/coolprop,ibell/coolprop,ibell/coolprop,ibell/coolprop,CoolProp/CoolProp-museum,ibell/coolprop,CoolProp/CoolProp-museum,ibell/coolprop,CoolProp/CoolProp-museum,CoolProp/CoolProp-museum