Add mercado pago

[pachCode]

[codecov]

Codecov Report

Merging #158 (44ef70c) into main (18c5378) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #158   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines           85        85           
=========================================
  Hits            85        85           

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Files	Coverage Δ
clabe/banks.py	100.00% <ø> (ø)
clabe/version.py	100.00% <100.00%> (ø)

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[alexviquez]

i belive i can fly, LGTM