Fix typo on Boule description in README

[santisoler]

Fix typo on Boulde description in README.md file. It said break where it should be saying bread.

Reminders

• [ ] Run make format and make check to make sure the code follows the style guide.
• [ ] Add tests for new features or tests that would have caught the bug that you're fixing.
• [ ] Add new public functions/methods/classes to doc/api/index.rst.
• [ ] Write detailed docstrings for all functions/methods.
• [ ] If adding new functionality, add an example to the docstring, gallery, and/or tutorials.

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[codecov[bot]]

Codecov Report

Merging #7 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master     #7   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines          43     43           
  Branches        1      1           
=====================================
  Hits           43     43

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