fixing excess fields on DocumentStep

[alexviquez]

We add a excess field function to remove aditional data to the VerificationDocumentStep class

[codecov]

Codecov Report

Merging #119 (b730338) into master (001eec7) will increase coverage by 0.05%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   98.03%   98.09%   +0.05%     
==========================================
  Files          11       12       +1     
  Lines         357      367      +10     
==========================================
+ Hits          350      360      +10     
  Misses          7        7              

Flag	Coverage Δ
unittests	98.09% <100.00%> (+0.05%)	⬆️

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Files	Coverage Δ
mati/resources/verifications.py	100.00% <ø> (ø)
mati/types/enums.py	96.06% <100.00%> (+0.30%)	⬆️
mati/version.py	100.00% <100.00%> (ø)

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