Fixed case of initilize method for DBClient

R/DBClientClass/Initialize.R

@@ -1,6 +1,6 @@
 client <- NULL
 
-Initialize <- function(client) {
+initialize <- function(client) {
   if (is.null(client) || !is.R6(client) || inherits(client, "DBClient")) {
   	stop("DBClient instance required!")
   }