JSONConfig.init?() should return nil, but returns self

[neoneye]

https://github.com/iamjono/JSONConfig/blob/master/Sources/jsonConfig.swift

When providing a path to a non-existing file, then Settings file does not exist is printed and the constructor succeeds. Here I would expect init to return nil instead of self. This would make it easier to troubleshoot.

I'm using JSONConfig via the Perfect-Local-Auth-PostgreSQL-Template project.