Fix for create-mpileup

[ayamada]

Fix mismatched arity, and add related tests.

[codecov-io]

Codecov Report

Merging #52 into master will increase coverage by 0.33%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #52      +/-   ##
=========================================
+ Coverage   73.36%   73.7%   +0.33%     
=========================================
  Files          56      56              
  Lines        3293    3293              
  Branches      329     333       +4     
=========================================
+ Hits         2416    2427      +11     
+ Misses        548     533      -15     
- Partials      329     333       +4

Impacted Files	Coverage Δ
src/cljam/pileup.clj	100% <100%> (+14.28%)	⬆️
src/cljam/pileup/mpileup.clj	88.7% <0%> (+7.25%)	⬆️

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[alumi]

Thanks! 👍