Clarify bootstrap requirements in README.md

[sergiomb2]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.50%. Comparing base (f4de1cc) to head (9ad06f4).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   83.50%   83.50%           
=======================================
  Files           5        5           
  Lines        4159     4159           
  Branches      985      985           
=======================================
  Hits         3473     3473           
  Misses        686      686           

Flag	Coverage Δ
unittests	83.50% <ø> (ø)

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