Add NO_HUP option to zshrc

This prevents zsh from killing background processes when the shell exits

zshrc

@@ -1,7 +1,7 @@
 HISTFILE=~/.histfile
 HISTSIZE=1000
 SAVEHIST=1000
-setopt incappendhistory nomatch correct
+setopt incappendhistory nomatch correct NO_HUP
 unsetopt beep
 bindkey -v
 zstyle :compinstall filename '/home/drew/.zshrc'