try to non-block locking of a filelock is very long

[awaizman1]

Hi,

OS: Win10/7
Python: 3.6.8
py-filelock: 3.0.12

I try to acquire a filelock without blocking (i.e. timeout=0). when the file is locked this operation takes 1sec (although should return immediately).
I did dome deep dive here and figured out that the reason is msvcrt.locking function (which implemented using _locking - even in a pure C++ project it takes 1sec to try acquire already locked file using _locking.

Using winapi LockFile doesn't have this problem - it returns immediately when the file is already locked .
Do you think it worth change py-filelock implementation to use LockFile instead of _locking?

in my usecase, i'm trying to acquire the lock but if it is already locked I can ignore it and so other stuff. paying 1sec for each such check is crucial for me.

Thanks!

[awaizman1]

suggested PR #66