Support Drawable icons

[vlonjat-gashi]

spaceNavigationView.addSpaceItem(new SpaceItem("HOME", R.drawable.yourDrawable)); should support Drawables as well

[rayliverified]

Same as #21
FYI, support for drawables was removed after v1.3.0
To use drawables, revert back to v1.3.0
Hope this helped! 👍

[armcha]

@vlonjatg Fixed in new version 1.4.0