scrollable_panel 0.4.1

drag to expand and then can scroll contents. similar "Nearby spots" panel on google map app.

[0.4.1] - 2021/03/12

• add getter isOpen, isClose, isExpand
• add test code

[0.4.0] - 2021/03/04

• null safety support required dart version >=2.12.0

[0.3.0] - 2021/03/03

• add parameter onOpen, defaultPanelState
• add open() method
• add dartdoc

[0.2.2] - 2020/09/11

• add onClose, onExpand
• WillPopScope

[0.2.1] - 2020/09/11

• add animation getter

[0.2.0] - 2020/09/10

• update panel usage

[0.1.2] - 2019/10/29

• fix negative velocity

[0.1.1] - 2019/10/23

• delete debug log

[0.1.0] - 2019/10/22

• add velocity control and defaultPanelSize

[0.0.3] - 2019/10/18

• fix bug and example

[0.0.2] - 2019/10/18

• fix bug and example

[0.0.1] - 2019/10/09

• initial release.