request: support pathlib objects #8

>>> import telfhash
>>> import pathlib
>>> a = pathlib.Path('/bin/ls')
>>> type(a)
<class 'pathlib.PosixPath'>
>>> telfhash.telfhash(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/nix/store/g4a5izmyv29k6jibzmwa9a8yv2gyj1nw-python3-3.9.6-env/lib/python3.9/site-packages/telfhash/telfhash.py", line 487, in telfhash
    files_list += expand_filepath(path, recursive=recursive)
  File "/nix/store/g4a5izmyv29k6jibzmwa9a8yv2gyj1nw-python3-3.9.6-env/lib/python3.9/site-packages/telfhash/telfhash.py", line 353, in expand_filepath
    for filepath in glob.glob(input_filepath):
  File "/nix/store/81lwy2hfqj4c1943b1x8a0qsivjhdhw9-python3-3.9.6/lib/python3.9/glob.py", line 22, in glob
    return list(iglob(pathname, recursive=recursive))
  File "/nix/store/81lwy2hfqj4c1943b1x8a0qsivjhdhw9-python3-3.9.6/lib/python3.9/glob.py", line 44, in _iglob
    if not has_magic(pathname):
  File "/nix/store/81lwy2hfqj4c1943b1x8a0qsivjhdhw9-python3-3.9.6/lib/python3.9/glob.py", line 156, in has_magic
    match = magic_check.search(s)
TypeError: expected string or bytes-like object