rename function to =>: to make it right-associative

[winitzki]

Cosmetic renames.

[codecov]

Codecov Report

Merging #17 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   94.19%   94.19%           
=======================================
  Files           8        8           
  Lines         603      603           
  Branches       60       55    -5     
=======================================
  Hits          568      568           
  Misses         35       35

Impacted Files	Coverage Δ
src/main/scala/io/chymyst/ch/TermExpr.scala	92.74% <100%> (ø)	⬆️

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