Check best way to set root logger

[gabrielgflower]

As django docs does, maybe we could set directly the root logger instead of having an empty key.
Seems like it works just as same and feels less confusing.
'root': { 'handlers': ['console'], 'level': 'INFO', },
instead of
'loggers': { '': { 'handlers': ['console'], 'level': 'INFO', }, },

[jonathadv]

Good point! Feel free to open a PR fixing the README.me by adding this information and the Django's official reference.

[gabrielgflower]

PR for fix #6