Added missing package

R/DBClientClass/Initialize.R

@@ -1,7 +1,7 @@
 client <- NULL
 
 initialize <- function(client) {
-  if (is.null(client) || !is.R6(client) || inherits(client, "DBClient")) {
+  if (is.null(client) || !R6::is.R6(client) || inherits(client, "DBClient")) {
   	stop("DBClient instance required!")
   }
   private$client <- client