Fix typo in unbound_args.jl

[codecov[bot]]

Codecov Report

Merging #217 (9d566bf) into master (8b5f214) will decrease coverage by 9.74%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
- Coverage   76.80%   67.06%   -9.74%     
==========================================
  Files          11       11              
  Lines         763      580     -183     
==========================================
- Hits          586      389     -197     
- Misses        177      191      +14     

Flag	Coverage Δ
unittests	67.06% <ø> (-9.74%)	:arrow_down:

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Files	Coverage Δ
src/unbound_args.jl	81.81% <ø> (+1.81%)	:arrow_up:

... and 10 files with indirect coverage changes

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