Update stackbrew updater with Node v6.3

Author: Hans Kristian Flaatten

generate-stackbrew-library.sh

@@ -6,7 +6,7 @@ hash git 2>/dev/null || { echo >&2 "git not found, exiting."; }
 array_0_12='0';
 array_4_4='4 argon';
 array_5_12='5';
-array_6_2='6 latest';
+array_6_3='6 latest';
 
 cd $(cd ${0%/*} && pwd -P);