com.mikepenz.iconics.view.IconicsImageView won't show image
## About this issue

This issue, which I assume is a doc issue is causing me great pain and as a last resort I'm posing the question.

The short of it; using the following XML in my layout file shows NO image, no icon.

`<com.mikepenz.iconics.view.IconicsImageView
    android:layout_width="72dp"
    android:layout_height="72dp"
    app:iiv_color="@android:color/holo_red_dark"
    app:iiv_icon="gmd-favorite" />`

This is right out of the readme and samples but I don't see what is blocking this from working.   I can set drawables in code, no problem but via XML it isn't working.

I'm initializing the library in the override to onCreate within my application as follows:

`Iconics.init(this)`

I am using the 5.1.0 library (updating isn't an option as a 3rd party library I'm using breaks with the minSDK of the updated library.

Oh, can't run the sample; it appears to use a pre-released version of Android Studio, I'm using the latest release version 2020.03.01 of Arctic Fox.