Update README.md

[abonnaudet-ledger]

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it.

Additional comments

Please post additional comments in this section if you have them, otherwise delete it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.19%. Comparing base (481a418) to head (2e6eff4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #706   +/-   ##
=======================================
  Coverage   60.19%   60.19%           
=======================================
  Files          12       12           
  Lines        1726     1726           
=======================================
  Hits         1039     1039           
  Misses        687      687           

Flag	Coverage Δ
unittests	60.19% <ø> (ø)

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