[feature] Updated visibility of the substitute method in the Util class

Author: valydia

csv-validator-core/src/main/scala/uk/gov/nationalarchives/csv/validator/Util.scala

@@ -207,7 +207,7 @@ object Util {
 
     val separator: Char = FILE_SEPARATOR
 
-    private def substitutePath(filename: String): String = {
+    def substitutePath(filename: String): String = {
 
       pathSubstitutions.collectFirst{
         case (subFrom, subTo) if filename.contains(subFrom) =>