improved history implementation

app/src/main/kotlin/com/tutpro/baresip/HistoryRow.kt

@@ -1,10 +1,12 @@
 package com.tutpro.baresip
 
-class HistoryRow(val peerURI: String, val direction: Int, val time: String) {
+class HistoryRow(val peerURI: String, val direction: Int, val time: String, val index: Int) {
 
     val directions = ArrayList<Int>()
+    val indexes = ArrayList<Int>()
 
     init {
         directions.add(direction)
+        indexes.add(index)
     }
 }