Fix a bug

[putianyi889]

putianyi889#1

[codecov]

Codecov Report

Merging #5 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master       #5   +/-   ##
=======================================
  Coverage   55.85%   55.85%           
=======================================
  Files          26       26           
  Lines        2025     2025           
=======================================
  Hits         1131     1131           
  Misses        894      894

Impacted Files	Coverage Δ
src/Spaces/PolynomialSpace.jl	83.33% <100%> (ø)	⬆️

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