logger doesn't support utf-8, resulting in error in Windows Command Promp

[shaikh-raj]

When I was trying to explore this tool in windows command prompt, it gives me error for Unicode Not Supported. After digging inside the code, I found that it requires to add utf-8 additionally in logger argument, which will add support for user to run from windows command prompt.

More details regarding issue can be found here.. https://github.com/Delgan/loguru/issues/124

Please let me know if I can create Pull Request for this small fix. I have made the changes in local.

[dilawar]

@shaikh-raj I didn't receive any notification from this repo for a while. I just saw it today. PRs are welcome. Thanks.