self port of zxing PR 1158

[makiuchi-d]

zxing/zxing/pull/1158

The QRCode in #14 can read without decoder hint.

[codecov-io]

Codecov Report

Merging #16 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   98.33%   98.33%   -0.01%     
==========================================
  Files         107      107              
  Lines        8625     8624       -1     
==========================================
- Hits         8481     8480       -1     
  Misses         84       84              
  Partials       60       60

Impacted Files	Coverage Δ
qrcode/detector/finder_pattern_finder.go	100% <100%> (ø)	⬆️

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