datamatrix: first FNC1 as ascii 232

[mutm]

To support GS1 Datamatrix format

[codecov-commenter]

Codecov Report

Merging #42 (2ba9850) into master (57132e8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   97.99%   97.99%           
=======================================
  Files         118      118           
  Lines        8285     8288    +3     
=======================================
+ Hits         8119     8122    +3     
  Misses         97       97           
  Partials       69       69           

Impacted Files	Coverage Δ
datamatrix/encoder/high_level_encoder.go	97.22% <100.00%> (+0.04%)	⬆️

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[makiuchi-d]

Thank you for your contribution.

IMO, it should be indicated by EncodeHintType_GS1_FORMAT rather than a charactor \u00e8.
And it need to implement the decoder support.

I want it be implemented on the original ZXing before this repository.