⚓ T212133 EventStreams fails with since parameter

>>> from pywikibot.comms.eventstreams import EventStreams
>>> stream = EventStreams(streams='recentchange', since='20160101111111')

Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    stream = EventStreams(streams='recentchange', since='20160101111111')
  File "pywikibot\tools\__init__.py", line 1739, in wrapper
    return obj(*__args, **__kw)
  File "pywikibot\comms\eventstreams.py", line 125, in __init__
    self._url = kwargs.get('url') or self.url
  File "pywikibot\comms\eventstreams.py", line 161, in url
    if self._since else ''))
TypeError: coercing to Unicode: need string or buffer, Timestamp found

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