title: android MaterialBetterSpinner hint color doesn't change
body: <p>I'm trying to change the color of material design better spinner, but nothing works,i tried to change it to color that defined in color or by define a style and use it in the theme:</p>
  
  <pre><code>android:theme="@style/TextLabel"
  </code></pre>
  
  <p>but nothing helped.</p>
  
  <pre><code>&lt;com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner
      android:id="@+id/some"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:hint="Range"
      android:textColorHint="@color/colorHint"
      app:met_floatingLabel="normal" /&gt;
  </code></pre>