fix a spelling typo

[paralax]

No description provided.

[jmwright]

Thanks for the contribution @paralax !

[coveralls]

Coverage remained the same at 92.252% when pulling 96f8f7e on paralax:patch-1 into 7555554 on dcowden:master.

[AppVeyorBot]

✅ Build cadquery 1.0.45 completed (commit afe4c0d90f by @paralax)

[codecov-io]

Codecov Report

Merging #265 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #265   +/-   ##
=======================================
  Coverage   92.79%   92.79%           
=======================================
  Files          10       10           
  Lines        2207     2207           
=======================================
  Hits         2048     2048           
  Misses        159      159

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