wand.image import failed on imagemagick 6.9.6.2

[changwoo]

From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=841548

  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/wand/image.py", line 21, in <module>
      from .color import Color
    File "/usr/lib/python3/dist-packages/wand/color.py", line 12, in <module>
      from .version import QUANTUM_DEPTH
    File "/usr/lib/python3/dist-packages/wand/version.py", line 95, in <module>
      *map(int, MAGICK_RELEASE_DATE_STRING.split('-')))
  TypeError: Required argument 'month' (pos 2) not found

The format of the release date seems to be changed.

[changwoo]

tests/misc_test.py:test_version() should be fixed too.

_________________________________ test_version _________________________________

    def test_version():
        """Test version strings."""
        match = re.match('^ImageMagick\s+\d+\.\d+\.\d+(?:-\d+)?', MAGICK_VERSION)
        assert match
        assert isinstance(MAGICK_VERSION_INFO, tuple)
        assert (len(MAGICK_VERSION_INFO) ==
                match.group(0).count('.') + match.group(0).count('-') + 1)
        assert all(isinstance(v, int) for v in MAGICK_VERSION_INFO)
        assert isinstance(MAGICK_VERSION_NUMBER, numbers.Integral)
        assert isinstance(MAGICK_RELEASE_DATE, datetime.date)
>       assert (MAGICK_RELEASE_DATE_STRING ==
                MAGICK_RELEASE_DATE.strftime('%Y-%m-%d'))
E       assert '20161010' == '2016-10-10'
E         - 20161010
E         + 2016-10-10
E         ?     +  +