check_cracked_call handles named arguments better

[MichaelChirico]

Closes #227

[codecov-commenter]

Codecov Report

Merging #250 (94e27f7) into master (13bcae8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #250   +/-   ##
=======================================
  Coverage   98.80%   98.81%           
=======================================
  Files          17       17           
  Lines        1342     1348    +6     
=======================================
+ Hits         1326     1332    +6     
  Misses         16       16           

Impacted Files	Coverage Δ
R/check_cracked_messages.R	100.00% <100.00%> (ø)

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