backdrop 0.3.4

Backdrop implementation in dart. (https://material.io/design/components/backdrop.html)

[0.3.4] - 5 June 2020

• subHeader attribute added to BackdropScaffold [https://github.com/fluttercommunity/backdrop/pull/29]
• BackdropSubHeader provided to implement sub header following MDG [https://github.com/fluttercommunity/backdrop/pull/29]

[0.3.3] - 4 June 2020

• refactor showFrontLayer to concealBackLayer and showBackLayer to revealBackLayer [https://github.com/fluttercommunity/backdrop/pull/30]
• added onBackLayerConcealed and onBackLayerRevealed callbacks [https://github.com/fluttercommunity/backdrop/pull/30]

[0.3.2] - 28 May 2020

• fix typo [https://github.com/fluttercommunity/backdrop/pull/27]

[0.3.1] - 27 May 2020

• floatingActionButton and other related attributes to BackdropScaffold [https://github.com/fluttercommunity/backdrop/pull/21]

[0.3.0] - 27 May 2020

• BackdropAppBar added [https://github.com/fluttercommunity/backdrop/pull/23]

[0.2.17] - 26 May 2020

• animation duration fix [https://github.com/fluttercommunity/backdrop/pull/19]
• configurable inactive layer color with animating color change [https://github.com/fluttercommunity/backdrop/pull/20]
• Improve the front layer border radius [https://github.com/fluttercommunity/backdrop/pull/22]

[0.2.15] - 15 May 2020

• bug fix: unfocusing keyboard before fling. [https://github.com/fluttercommunity/backdrop/pull/16]

[0.2.14] - 21 April 2020

• Moved package from gitlab.com/daadu/backdrop to github.com/fluttercommunity/backdrop

[0.2.13] - 21 April 2020

• Moved package to Flutter Community

[0.2.11] - 18 April 2020

• Reverting to v0.2.9

[0.2.10] - 18 April 2020

• Added documentation link in pubspec.yaml

[0.2.9] - 18 April 2020

• Documentation of classes and attributes

[0.2.8] - 16 January 2020

• disabling focus on backLayer when not visible

[0.2.7] - 18 December 2019

• updated README.md

[0.2.0] - 18 December 2019

• NavigationBackLayer widget - for easily implement navigation with backdrop
• stickyFrontLayer - dynamic height for backdrop - based on height of backLayer
• animationCurve for backdrop can be passed as parameter
• minor bug fixes

[0.1.0] - 28 July 2018.

• opacity fixes in BackdropScaffold.
• headerHeight option added in BackdropScaffold.
• frontLayerBorderRadius option added in BackdropScaffold
• refactor: body -> frontLayer
• refactor: backpanel -> backLayer
• BackdropToggleButton widget implemented.

[0.0.1] - 21 July 2018.

• Basic backdrop implementation.
• BackdropScaffold widget implemented.