migrate .zsh-update file

oh-my-zsh.sh

@@ -4,6 +4,11 @@ if [[ -z "$ZSH_CACHE_DIR" ]]; then
   ZSH_CACHE_DIR="$ZSH/cache"
 fi
 
+# Migrate .zsh-update file to $ZSH_CACHE_DIR
+if [ -f ~/.zsh-update ] && [ ! -f ${ZSH_CACHE_DIR}/.zsh-update ]; then
+    mv ~/.zsh-update ${ZSH_CACHE_DIR}/.zsh-update
+fi
+
 # Check for updates on initial load...
 if [ "$DISABLE_AUTO_UPDATE" != "true" ]; then
   env ZSH=$ZSH ZSH_CACHE_DIR=$ZSH_CACHE_DIR DISABLE_UPDATE_PROMPT=$DISABLE_UPDATE_PROMPT zsh -f $ZSH/tools/check_for_upgrade.sh