fix missing batch header partial files

[jasonbornsteinMOOV]

Workaround for incorrectly created partial files, where entries exist without a BatchHeader record.

Changes

Pass a new parameter AllowMissingBatchHeader: true to ach.ValidateOpts when using ach.NewReader to read an ACH file.

Why Are Changes Being Made

Workaround the issue where partial files (full batches with no file header/control record) are being created without batch headers.

[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (c908b30) 12.22% compared to head (61d2e1c) 12.09%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
- Coverage   12.22%   12.09%   -0.14%     
==========================================
  Files          10       10              
  Lines         368      372       +4     
==========================================
  Hits           45       45              
- Misses        318      322       +4     
  Partials        5        5              

Files	Coverage Δ
pkg/filelist/bucket.go	0.00% <0.00%> (ø)
pkg/filelist/filesystem.go	0.00% <0.00%> (ø)
pkg/filelist/list.go	0.00% <0.00%> (ø)
pkg/filelist/achgateway.go	0.00% <0.00%> (ø)
pkg/filelist/common.go	0.00% <0.00%> (ø)

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