use max rather than maximum to decide if need to use epislon

[oxinabox]

This saves on allocations

[codecov]

Codecov Report

Merging #98 (8488424) into main (2c192ec) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   98.60%   98.60%           
=======================================
  Files          12       12           
  Lines         143      143           
=======================================
  Hits          141      141           
  Misses          2        2           

Impacted Files	Coverage Δ
src/scaling.jl	94.11% <100.00%> (ø)

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[glennmoy]

Might want to bump the patch as well (since it's an internal optimisation?)