Bug: cannot write multiple files into a tar or a zip.

[chfw]

for now, moban can only create a zip with one file. second file?

Exception ignored in: <function FS.__del__ at 0x1027f8598>
Traceback (most recent call last):
  File "/Users/jaska/github/moremoban/moban-env/lib/python3.7/site-packages/fs/base.py", line 117, in __del__
    self.close()
  File "/Users/jaska/github/moremoban/moban-env/lib/python3.7/site-packages/fs/zipfs.py", line 437, in close
    self._zip.close()