Add day of month for time filterable

app/src/main/java/net/pokeranalytics/android/model/filter/interfaces/TimeFilterable.kt

@@ -5,6 +5,7 @@ import java.util.*
 interface TimeFilterable {
 
     var dayOfWeek : Int?
+    var dayOfMonth : Int?
     var month : Int?
     var year : Int?
 
@@ -13,6 +14,7 @@ interface TimeFilterable {
             val cal = Calendar.getInstance()
             cal.time = it
             dayOfWeek = cal.get(Calendar.DAY_OF_WEEK)
+            dayOfMonth = cal.get(Calendar.DAY_OF_MONTH)
             month = cal.get(Calendar.MONTH)
             year = cal.get(Calendar.YEAR)
         }