Add aria-hidden attributes to icons

Author: jean-1314

src/slider.vue

@@ -32,10 +32,10 @@
     </div>
     <template v-if="controlBtn">
       <button class="slider-btn slider-btn-left" :aria-label="prevBtnLabel" @click.stop="prev">
-        <i class="slider-icon slider-icon-left" />
+        <i class="slider-icon slider-icon-left" aria-hidden="true"/>
       </button>
       <button class="slider-btn slider-btn-right" :aria-label="nextBtnLabel" @click.stop="next">
-        <i class="slider-icon slider-icon-right" />
+        <i class="slider-icon slider-icon-right" aria-hidden="true"/>
       </button>
     </template>
   </div>