Button background color not set on 5.1.1 (API22)

The com.xgc1986.ripplebutton.widget.RippleButton is not displaying the app:buttonColor. It is only showing a gray background color.

Here is an example:

[xgc1986]

Sorry for the delay, I have been busy, this bug is going to be fix in 0.4.1 version, it will just take some minutes to upload the new version.

Awesome thanks!