Update README according new sugar specs

[esloch]

• sugar version:

  sugar version:1.9.3

• Python version:

  Python 3.10.13

• Operating System:

  Distributor ID: Ubuntu
  Description:    Ubuntu 23.10
  Release:        23.10
  Codename:       mantic
  Kernel       6.5.0-14-generic
  Arch:       x86_64

Description

The sugar specifications example does not correspond to the new release.

What I Did

$ sugar build
Traceback (most recent call last):
  File "/home/esloch/miniforge/envs/alertadengue/bin/sugar", line 8, in <module>
    sys.exit(app())
  File "/home/esloch/miniforge/envs/alertadengue/lib/python3.10/site-packages/sugar/cli.py", line 166, in app
    sugar = Sugar(args_cast, options_args, cmd_args)
  File "/home/esloch/miniforge/envs/alertadengue/lib/python3.10/site-packages/sugar/sugar.py", line 543, in __init__
    super().__init__(args, options_args, cmd_args)
  File "/home/esloch/miniforge/envs/alertadengue/lib/python3.10/site-packages/sugar/sugar.py", line 68, in __init__
    self._load_defaults()
  File "/home/esloch/miniforge/envs/alertadengue/lib/python3.10/site-packages/sugar/sugar.py", line 218, in _load_defaults
    for k, v in _defaults.items():
AttributeError: 'list' object has no attribute 'items'