how to change selected tab background color

[kathisai]

Hi, I tried with

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/colorPrimaryDark"/>
    <item android:state_selected="true" android:drawable="@color/colorPrimary"/>
    <item android:state_activated="true" android:drawable="@color/colorPrimary"/>
    <item android:state_checked="true" android:drawable="@color/colorPrimary"/>
    <item android:state_focused="true" android:drawable="@color/colorPrimary"/>
    <item android:drawable="@android:color/transparent"/>
</selector>

<com.astuetz.PagerSlidingTabStrip
        android:id="@+id/tabs"
        app:pstsShouldExpand="true"
        app:pstsTextAllCaps="true"
        android:layout_width="match_parent"
        app:pstsTabBackground="@drawable/cusotom_bg"
        android:background="@android:color/holo_blue_light"
        android:layout_height="48dp" />

It's showing only focused color. Did anyone get pressed_state color with this component ?

same mentioned in #140 also.