🎨 Replace AST typing to the native syntax (3.6+)

[Ousret]

Immediately following PR #192

[codecov-commenter]

Codecov Report

Merging #193 (b005cbf) into master (6ac98eb) will not change coverage.
The diff coverage is 98.13%.

@@           Coverage Diff           @@
##           master     #193   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files          11       11           
  Lines        1212     1212           
=======================================
  Hits         1089     1089           
  Misses        123      123           

Impacted Files	Coverage Δ
charset_normalizer/utils.py	86.17% <86.36%> (ø)
charset_normalizer/api.py	86.76% <100.00%> (ø)
charset_normalizer/cd.py	96.34% <100.00%> (ø)
charset_normalizer/cli/normalizer.py	73.91% <100.00%> (ø)
charset_normalizer/constant.py	100.00% <100.00%> (ø)
charset_normalizer/md.py	96.71% <100.00%> (ø)
charset_normalizer/models.py	86.66% <100.00%> (ø)

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