Unable to delete the log file used by zap.

[charankamarapu]

Describe the bug
I have add a file to the development config like this -

LogCfg.OutputPaths = []string{
		"stdout",
		"./logs.txt",
}

and then created a logger with logCfg.build() and later while exiting my application I wanted to delete that file but it throws an error saying file is being used by another process(windows) most probably it is being used by the logger. I was creating the file to upload the logs to somewhere and once app is about to exit I want to delete it. How can I do it? I even tried assigning nil to logger before deleting the file.

To Reproduce
You can just create a simple logger and try to delete the log file.

Expected behavior
File should get deleted.