v3.2.4

• improve ios platform something
• improve web platform something

v3.2.2

• improve flash something

v3.2.1

• improve continuous scan barcode

v3.2.0

• Flutter 3.0.1
• Dart 2.17.1
• fix something
• improve something

v3.1.0

• env

 Flutter 3.0.1
 Dart 2.17.1

• fix: #60

enhancement android browser

enhancement：#27

v3.0.0

• merge #26
• fix #19
• null safety
• dart version: >=2.12.0
• flutter: >=2.0.0

v2.0.0

• restructure
• improve something
• fix something

v1.6.0

• improve: improve design
• fix: something

v1.1.3

remove: web platform