Globbing doesn't work on Windows

[TAbdiukov]

Default cmd (not Bash), globbing doesn't work,

C:\test>dir /w
 Volume in drive C has no label.
 Volume Serial Number is 6A3E-D67E

 Directory of C:\test

[.]          [..]         00.mp3       01.mp3       02.mp3       03.mp3       04.mp3       05.mp3       06.mp3
07.mp3       08.mp3       09.mp3       10.mp3       11.mp3       12.mp3       13.mp3       14.mp3       15.mp3
16.mp3       17.mp3       18.mp3       19.mp3       20.mp3       21.mp3       22.mp3       23.mp3       24.mp3
25.mp3       26.mp3       27.mp3       28.mp3       29.mp3       30.mp3       31.mp3       32.mp3       33.mp3
34.mp3       35.mp3       36.mp3       37.mp3       38.mp3       39.mp3       40.mp3       41.mp3       42.mp3
43.mp3       44.mp3       45.mp3       46.mp3       47.mp3       cover.jpg    mp3cat.exe
              50 File(s)    398.020.706 bytes
               2 Dir(s)  41.034.919.936 bytes free

C:\test>mp3cat *.mp3 -o joined.mp3
Error: the file '*.mp3' does not exist.

C:\test>

Expected behavior: mp3cat *.mp3 -o joined.mp3 should work.

[TAbdiukov]

Please see #27