fix: add padding for tlv

[siohaza]

should fix #128

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.88%. Comparing base (4e90179) to head (10ec79a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
+ Coverage   71.86%   71.88%   +0.02%     
==========================================
  Files          46       46              
  Lines       11239    11248       +9     
==========================================
+ Hits         8077     8086       +9     
  Misses       2613     2613              
  Partials      549      549              

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