diff_for_humans loop in one minutes. #238
Description
I got strange return value from diff_for_humans
>>> import pendulum
>>> pendulum.__version__
'2.0.2'
>>> ptime = pendulum.datetime(2018, 6, 19, 5, 30, 8, tz='UTC')
>>> ptime.diff_for_humans()
u'41 seconds ago'
>>> ptime = pendulum.datetime(2018, 6, 19, 4, 30, 8, tz='UTC')
u'26 seconds ago'
>>> ptime.add(minutes=1).diff_for_humans()
u'28 seconds ago'
>>> ptime.add(hours=1).diff_for_humans()
u'a few seconds ago'
>>> ptime.add(days=1).diff_for_humans()
u'in 22 hours'
>>> pendulum.now().add(minutes=1).diff_for_humans()
u'in 1 minute'
>>> ptime.diff()
<Period [2018-06-19T04:30:08+00:00 -> 2018-06-19T06:28:35.180000+00:00]>