optimized code a bit.

fixed issue of not getting correct lastVisibleDate.

Author: AndroidDeveloperLB

library/src/main/java/com/alamkanak/weekview/SimpleDate.kt

@@ -0,0 +1,9 @@
+package com.alamkanak.weekview
+
+import java.util.*
+
+data class SimpleDate(val year: Int, val month: Int, val dayOfMonth: Int) {
+    override fun toString(): String = "$year-$month-$dayOfMonth"
+
+    constructor(cal: Calendar) : this(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH))
+}