Replace Array.prototype.findIndex with a for statement.

Author: yamagen0915

lib/vue-simple-suggest.vue

@@ -206,7 +206,13 @@ export default {
       return this.inputIsComponent ? '$off' : 'removeEventListener'
     },
     hoveredIndex () {
-      return this.suggestions.findIndex(el => this.hovered && (this.valueProperty(this.hovered) == this.valueProperty(el)))
+      for (let i = 0; i < this.suggestions.length; i++) {
+        const el = this.suggestions[i];
+        if (this.hovered && (this.valueProperty(this.hovered) == this.valueProperty(el))) {
+          return i;
+        }
+      }
+      return -1;
     },
     textLength () {
       return (this.text && this.text.length) || (this.inputElement.value.length) || 0