use PY_SSIZE_T_CLEAN

[methane]

Fixes #359.

[codecov]

Codecov Report

Merging #360 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   87.14%   87.14%           
=======================================
  Files          13       13           
  Lines        1556     1556           
=======================================
  Hits         1356     1356           
  Misses        200      200

---

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #360 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   87.14%   87.14%           
=======================================
  Files          13       13           
  Lines        1556     1556           
=======================================
  Hits         1356     1356           
  Misses        200      200

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3d046ad...1b3d9d6. Read the comment docs.