Don't require using Curry in doctests in test/runtests.jl

[goretkin]

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[codecov-commenter]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #4   +/-   ##
=======================================
  Coverage   90.90%   90.90%           
=======================================
  Files           1        1           
  Lines          11       11           
=======================================
  Hits           10       10           
  Misses          1        1           

Impacted Files	Coverage Δ
src/Curry.jl	90.90% <ø> (ø)

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