surpress warning

`exe/rdbg:25: warning: `**' interpreted as argument prefix`

with `RUBYOPT=-w`

Author: ko1

exe/rdbg

@@ -22,7 +22,7 @@ when :start
 
 when :attach
   require_relative "../lib/debug/client"
-  ::DEBUGGER__::CONFIG.set_config **config
+  ::DEBUGGER__::CONFIG.set_config(**config)
 
   begin
     if ARGV.empty? && config[:port]