Batch validation transaction code matches service class code

[bkmoovio]

#56

[codecov-io]

Codecov Report

Merging #382 into master will increase coverage by 0.24%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
+ Coverage    85.2%   85.44%   +0.24%     
==========================================
  Files         107      107              
  Lines        6684     6747      +63     
==========================================
+ Hits         5695     5765      +70     
+ Misses        712      710       -2     
+ Partials      277      272       -5

Impacted Files	Coverage Δ
batcher.go	100% <ø> (ø)	⬆️
batchDNE.go	87.23% <0%> (-3.88%)	⬇️
iatBatch.go	95.36% <0%> (-0.96%)	⬇️
batchMTE.go	100% <100%> (+8%)	⬆️
batchCOR.go	100% <100%> (+6.12%)	⬆️
test/ach-ccd-write/main.go	87.23% <100%> (ø)	⬆️
test/ach-mte-write/main.go	86.95% <100%> (ø)	⬆️
batchXCK.go	100% <100%> (ø)	⬆️
batchENR.go	80.35% <100%> (+4.43%)	⬆️
batchPPD.go	100% <100%> (+9.09%)	⬆️
... and 21 more

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[bkmoovio]

#56