invoking `acrylamid new` raises an exception

gistfile1.pytb

Traceback (most recent call last):
  File "/home/iromli/.virtualenv/groovematic/bin/acrylamid", line 9, in <module>
    load_entry_point('acrylamid==0.7.7', 'console_scripts', 'acrylamid')()
  File "/home/iromli/.virtualenv/groovematic/lib/python2.7/site-packages/acrylamid/__init__.py", line 213, in Acryl
    tasks.collected[options.parser](conf, env, options)
  File "/home/iromli/.virtualenv/groovematic/lib/python2.7/site-packages/acrylamid/tasks/new.py", line 42, in run
    fd, tmp = tempfile.mkstemp(suffix=ext, dir='.cache/')
  File "/home/iromli/.pyenv/versions/2.7.5/lib/python2.7/tempfile.py", line 304, in mkstemp
    return _mkstemp_inner(dir, prefix, suffix, flags)
  File "/home/iromli/.pyenv/versions/2.7.5/lib/python2.7/tempfile.py", line 237, in _mkstemp_inner
    file = _os.path.join(dir, pre + name + suf)
TypeError: cannot concatenate 'str' and 'list' objects

Try:

CONTENT_EXTENSION = ".md"

it seems the list version is only supported in the master (not sure, why).