zxing_lib 0.3.2

A Dart port of zxing.

[0.3.2] - 2021-06-22

• remove flutter dev-dep.
• replace buffer_image with image pkg in tests
• fix some bugs
• fix exception throws

[0.3.1] - 2021-06-19

• remove flutter dependencies
• add latin2~15 encoding

[0.3.0] - 2021-06-16

• fix datamatrix encode
• change some prop as dart style

[0.2.0] - 2021-06-10

• arrange comment and package
• get attrs refactor

[0.1.0] - 2021-06-08

• all unit test passed

[0.0.1] - 2021-06-01

• core code translate