Detect Git LFS username

[douglaslassance]

The plugin demands that you set the "username to lock files on the LFS server". If not set, it won't be able to recognize the content you can actually edit. Other Git clients such as TortoiseGit have no issue detecting the Git LFS user that should be used for a given clone. I was wondering why this plugin does not take the same approach and requires the user to input this information.