fix: AbstractMISP.from_dict() do not accept positional argument

[mokaddem]

Doing the following raise an exception:

json = '''{
    "type": "ip-src",
    "value": "8.8.8.8",
    "category": "Network activity",
    "to_ids": false,
    "proposal": false
    }'''
attribute = MISPAttribute()
attribute.from_json(json)

TypeError: from_dict() takes 1 positional argument but 2 were given

[coveralls]

Coverage remained the same at 64.29% when pulling 3faec3c on mokaddem:hotfix_from_dict into fdd9833 on MISP:master.

[codecov]

Codecov Report

Merging #205 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   64.28%   64.28%           
=======================================
  Files          23       23           
  Lines        3408     3408           
=======================================
  Hits         2191     2191           
  Misses       1217     1217

Impacted Files	Coverage Δ
pymisp/abstract.py	88.96% <0%> (ø)	⬆️

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[Rafiot]

Good catch!