Removed a manual file handler pitfall
It is a simple PR. 

It only removes a manual file handler pitfall from versioneer.py

As stated by [Pylint documentation](https://pylint.pycqa.org/en/latest/technical_reference/features.html)

"
consider-using-with (R1732)
Consider using 'with' for resource-allocating operations Emitted if a resource-allocating assignment or call may be replaced by a 'with' block. By using 'with' the release of the allocated resources is ensured even in the case of an exception.
"
> This file is generated by versioneer - we generally don't edit it manually.
> 
> Can you make the fix upstream and we can then regenerate? https://github.com/python-versioneer/python-versioneer

Sounds fair.

In this case, I'm closing this PR.

Thanks for the attention! > > This file is generated by versioneer - we generally don't edit it manually.
> > Can you make the fix upstream and we can then regenerate? https://github.com/python-versioneer/python-versioneer
> 
> Sounds fair.
> 
> In this case, I'm closing this PR.
> 
> Thanks for the attention!

Agree thanks!