Support package:qr v3.0.0

[xvrh]

• Upgrade dependency qr to latest version
• Introduce a mini "golden" library to simplify testing in the library. Update of golden files is done with export DART_UPDATE_GOLDEN=true && dart test

[DavBfr]

Looks good, thanks!

[DavBfr]

Those Aztec issues are on me, sorry.

[codecov-commenter]

Codecov Report

Merging #40 (ef8e4a7) into master (43c0c50) will decrease coverage by 0.65%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage   83.82%   83.17%   -0.66%     
==========================================
  Files          33       33              
  Lines        1768     1759       -9     
==========================================
- Hits         1482     1463      -19     
- Misses        286      296      +10     

Impacted Files	Coverage Δ
barcode/lib/src/qrcode.dart	100.00% <100.00%> (ø)
barcode/lib/src/barcode_2d.dart	33.33% <0.00%> (-43.94%)	:arrow_down:
barcode/lib/src/aztec.dart	90.02% <0.00%> (-0.56%)	:arrow_down:
barcode/lib/src/datamatrix.dart	77.33% <0.00%> (-0.55%)	:arrow_down:
barcode/lib/src/code128.dart	89.76% <0.00%> (-0.16%)	:arrow_down:
flutter/lib/src/painter.dart	67.41% <0.00%> (+0.74%)	:arrow_up:

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[DavBfr]

Merged, thanks.