[RFE] - Create directory structure, if it doesn't exist

[JacobCallahan]

• logzero version: 1.5.0
• Python version: 3.6.6
• Operating System: Fedora 28

Description

When passing in a log path, that doesn't exist, logzero will fail with a FileNotFoundError.
Instead, logzero should attempt to create the parent directories.

What I Did

tried to pass a relative path logs/clix.log to the logzero.logfile method. since logs didn't yet exist, the method failed with:

...
File "/usr/lib64/python3.6/logging/__init__.py", line 1060, in _open
    return open(self.baseFilename, self.mode, encoding=self.encoding)
FileNotFoundError: [Errno 2] No such file or directory: '/home/jake/Programming/clix/logs/clix.log'

Workaround

Add two lines to whatever file you use to init logzero. I believe this requires python 3.5+. You can always use os to do the same thing on older versions of python.

from pathlib import Path
...
Path(log_path).parent.mkdir(parents=True, exist_ok=True)