Add squares

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.75776% with 4 lines in your changes missing coverage. Please review.

Project coverage is 91.20%. Comparing base (70c7ec9) to head (4905514). Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
randomgen/squares.pyx	98.40%	3 Missing :warning:
randomgen/tests/test_direct.py	99.23%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #377 +/- ## ========================================== + Coverage 90.86% 91.20% +0.34% ========================================== Files 53 54 +1 Lines 8121 8441 +320 Branches 504 535 +31 ========================================== + Hits 7379 7699 +320 + Misses 716 715 -1 - Partials 26 27 +1 ``` | [Flag](https://app.codecov.io/gh/bashtage/randomgen/pull/377/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kevin+Sheppard) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/bashtage/randomgen/pull/377/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kevin+Sheppard) | `89.84% <98.13%> (-1.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kevin+Sheppard#carryforward-flags-in-the-pull-request-comment) to find out more.

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