Null safety support

3.0.0

Version 3.0.0. Upgraded pubspecs and changelog

Fixed web support

2.0.1

Fixed web support

v1.5.7

• Updated the examples
• Fixed some issues with flutter_device_locale and swift

v1.5.1

• Updated the flutter_device_locale dependency to avoid a possible exception
• Updated the example to AndroidX

v1.2.6

Updated links, license, readme