Add autojump to the end of PROMPT_COMMAND

Created by: JrCs

Hi, i use a PROMPT_COMMAND with a function to get the latest exit code like this

prompt() {
    # Check exit code
    local exit_code=$?
    if [[ $exit_code -eq 0 ]];then
        # do something
    else
       # do other things
    fi
}

PROMPT_COMMAND="prompt"

The problem with the modification of PROMPT_COMMAND by autojump.bash is that it add himself at the start of the PROMPT_COMMAND variable and so the exit code in my function is always 0. It will better if autojump will add himself at the end of the PROMPT_COMMAND variable to avoid this issue.

In attachment the patch to fix this issue