loading_button 0.0.3+1

Loading button with simple implementation

[0.0.3+1] - 2020.02.20

• Text color based on background color fix

[0.0.3] - 2020.02.20

• Update the background on demand
• Text color based on background color

[0.0.2] - 2019.11.21

• Background transparency bug fix

[0.0.1+1] - 2019.09.12

• Added example

[0.0.1] - 2019.09.12

• Initial release.