Don’t report that Oh My Zsh has been updated when it hasn’t.

tools/upgrade.sh

@@ -1,6 +1,9 @@
 current_path=`pwd`
 printf '\033[0;34m%s\033[0m\n' "Upgrading Oh My Zsh"
-( cd $ZSH && git pull origin master )
+cd $ZSH
+
+if git pull origin master
+then
   printf '\033[0;32m%s\033[0m\n' '         __                                     __   '
   printf '\033[0;32m%s\033[0m\n' '  ____  / /_     ____ ___  __  __   ____  _____/ /_  '
   printf '\033[0;32m%s\033[0m\n' ' / __ \/ __ \   / __ `__ \/ / / /  /_  / / ___/ __ \ '
@@ -9,4 +12,8 @@ printf '\033[0;32m%s\033[0m\n' '\____/_/ /_/  /_/ /_/ /_/\__, /    /___/____/_/
   printf '\033[0;32m%s\033[0m\n' '                        /____/                       '
   printf '\033[0;34m%s\033[0m\n' 'Hooray! Oh My Zsh has been updated and/or is at the current version.'
   printf '\033[0;34m%s\033[1m%s\033[0m\n' 'To keep up on the latest, be sure to follow Oh My Zsh on twitter: ' 'http://twitter.com/ohmyzsh'
+else
+  printf '\033[0;31m%s\033[0m\n' 'There was an error updating. Try again later?'
+fi
+
 cd "$current_path"