expandable 2.1.0+3

A Flutter widget that can be expanded or collapsed by clicking on a header or an icon.

[2.1.0] - 04/5/2019

• ExpandablePanel does not lose its state if its parent is rebuilt.
• Example file is moved to example folder for ease of running it.

[2.0.0] - 02/14/2019

• Eliminated the dependency on ScopedModel
• Introduced ExpandableNotifier and ExpandableController
• This is a breaking change. See README.md for details on migration from 1.x to 2.0

[1.1.0] - 02/01/2019

• Added ExpandablePanel, a configurable expandable widget with optional header and icon

[1.0.0] - 01/29/2019

• Initial release