title: react-native-swiper method scrollBy
body: <p>The method does not work if you click on the index 0. If I click on index 0, 1 and 2 will stop working. If I click 2 times on 1 or 2, then the slider will go to the desired slide. But the zero index does not work at all. Tell me please, what could be the problem?</p>
  
  <pre><code>   &lt;Swiper
          onMomentumScrollEnd={(e, state, context) =&gt; this.setState({index: 
          state.index})}
          ref={(swiper) =&gt; {this.swiper = swiper;}}
          showsButtons={false}
          width={500}
          height={500}
          showsPagination={false}
          index={0}
          loop={true} &gt;
          &lt;View&gt;
              &lt;Text&gt;One&lt;/Text&gt;
          &lt;/View&gt;
          &lt;View&gt;
              &lt;Text&gt;Two&lt;/Text&gt;
          &lt;/View&gt;
          &lt;View&gt;
              &lt;Text&gt;Three&lt;/Text&gt;
          &lt;/View&gt;
      &lt;/Swiper&gt;
      &lt;Text onPress={()=&gt;{this.swiper.scrollBy(0, true)}}&gt;One&lt;/Text&gt;
      &lt;Text onPress={()=&gt;{this.swiper.scrollBy(1, true)}}&gt;Two&lt;/Text&gt;
      &lt;Text onPress={()=&gt;{this.swiper.scrollBy(2, true)}}&gt;Three&lt;/Text&gt;
  </code></pre>