adds todo
@@ -17,6 +17,7 @@ class VersionBase(metaclass=ABCMeta):
@classmethod
def cmp(cls, v1: 'VersionBase', v2: 'VersionBase') -> int:
""" Compares two instances. """
+ # TODO types checking
if v1._version > v2._version:
return 1
elif v1._version == v2._version:
