auto-upadate feature will now reset the epoch so that if a user doesn't say...

auto-upadate feature will now reset the epoch so that if a user doesn't say yes, it won't ask them again for a while. fixes #1240

tools/check_for_upgrade.sh

@@ -32,9 +32,10 @@ then
       echo "[Oh My Zsh] Would you like to check for updates?"
       echo "Type Y to update oh-my-zsh: \c"
       read line
-      if [ "$line" = Y ] || [ "$line" = y ]
-      then
+      if [ "$line" = Y ] || [ "$line" = y ]; then
         _upgrade_zsh
+      else
+        _update_zsh_update
       fi
     fi
   fi