Different Parsing Behavior : 1.x and 2.x

[CtheSky]

There's a different parsing behavior between version 1.x and 2.x.

pendulum 1.5.1
>>> pendulum.parse('2011-8')
<Pendulum [2011-08-09T00:00:00+00:00]>

pendulum 2.0.3
>>> pendulum.parse('2011-8')
ParserError: Unable to parse string [2011-8]

It seems like the leading zero is required since "2011-08" can be parsed correctly, but it's not mentioned in the change log. Will it be fixed or supported in future?