Replace one by oneunit

[sostock]

This should not actually have any effect (it might matter in bspline_returntype).

[codecov-commenter]

Codecov Report

Merging #12 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #12   +/-   ##
=======================================
  Coverage   94.45%   94.45%           
=======================================
  Files           6        6           
  Lines         433      433           
=======================================
  Hits          409      409           
  Misses         24       24           

Impacted Files	Coverage Δ
src/BSplines.jl	100.00% <100.00%> (ø)
src/bsplinebasis.jl	99.10% <100.00%> (ø)

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