asset_button 1.1.2

image button library,include imagebutton & image loader & asset image,etc

[1.1.2] - fix bug

• bug fixed: after imageNormal changed, the image doesnot update

[1.1.0] - example

• update example

[1.0.3] - readme

• update readme

[1.0.2] - readme

• update readme

[1.0.1] - homepage

• homepage

[1.0.0] - example

• example using lib

[0.0.1] - init

• init