add FOB to Shipment

[CodeSmell]

In support of #43

[codecov-io]

Codecov Report

Merging #105 (9e98d80) into master (7790b01) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #105      +/-   ##
============================================
+ Coverage     87.42%   87.52%   +0.09%     
- Complexity      829      838       +9     
============================================
  Files            76       78       +2     
  Lines          2171     2188      +17     
  Branches        215      217       +2     
============================================
+ Hits           1898     1915      +17     
  Misses          183      183              
  Partials         90       90              

Impacted Files	Coverage Δ	Complexity Δ
.../x12/asn856/DefaultAsn856TransactionSetParser.java	90.50% <100.00%> (+0.14%)	61.00 <0.00> (+1.00)
...main/java/com/walmartlabs/x12/asn856/Shipment.java	77.14% <100.00%> (+2.14%)	18.00 <2.00> (+2.00)
...abs/x12/common/segment/FOBRelatedInstructions.java	100.00% <100.00%> (ø)	3.00 <3.00> (?)
...n/segment/parser/FOBRelatedInstructionsParser.java	100.00% <100.00%> (ø)	3.00 <3.00> (?)

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