Merge pull request #103 from kumabook/focusview_selected_index

focusView.selectedIndex should be `> 0`

Author: kazuhiro4949

PagingKit/PagingMenuView.swift

@@ -421,7 +421,7 @@ open class PagingMenuView: UIScrollView {
         focusView.center = CGPoint(x: centerPointX, y: center.y)
 
         let expectedIndex = (focusView.center.x < leftFrame.maxX) ? index : rightIndex
-        focusView.selectedIndex = min(expectedIndex, numberOfItem - 1)
+        focusView.selectedIndex = max(0, min(expectedIndex, numberOfItem - 1))
 
         contentOffset = CGPoint(x: normaizedOffsetX, y:0)