code: @NonNull
      public IconicsDrawable typeface(@Nullable Typeface typeface) {
          mIconBrush.getPaint().setTypeface(typeface);
  
          invalidateSelf();
          return this;
      }
docs: sets the typeface of the drawable
  NOTE THIS WILL OVERWRITE THE ICONFONT!
  
  @return The current IconicsDrawable for chaining.