❇️ Add support for (nine) encoding that have no aliases

[Ousret]

Close #323

List of added references:

IANA_NO_ALIASES = [
    "cp720",
    "cp737",
    "cp856",
    "cp874",
    "cp875",
    "cp1006",
    "koi8_r",
    "koi8_t",
    "koi8_u",
]

[codecov-commenter]

Codecov Report

Merging #328 (2f47947) into master (56775a3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master     #328   +/-   ##
=======================================
  Coverage   90.20%   90.21%           
=======================================
  Files          12       12           
  Lines        1215     1216    +1     
=======================================
+ Hits         1096     1097    +1     
  Misses        119      119           

Files Changed	Coverage Δ
charset_normalizer/constant.py	100.00% <100.00%> (ø)