fix https://github.com/Neilpang/acme.sh/issues/478

acme.sh

@@ -2225,11 +2225,13 @@ _regAccount() {
   _reg_length="$1"
 
   if [ ! -f "$ACCOUNT_KEY_PATH" ] && [ -f "$_OLD_ACCOUNT_KEY" ]; then
+    mkdir -p "$CA_DIR"
     _info "mv $_OLD_ACCOUNT_KEY to $ACCOUNT_KEY_PATH"
     mv "$_OLD_ACCOUNT_KEY" "$ACCOUNT_KEY_PATH"
   fi
 
   if [ ! -f "$ACCOUNT_JSON_PATH" ] && [ -f "$_OLD_ACCOUNT_JSON" ]; then
+    mkdir -p "$CA_DIR"
     _info "mv $_OLD_ACCOUNT_JSON to $ACCOUNT_JSON_PATH"
     mv "$_OLD_ACCOUNT_JSON" "$ACCOUNT_JSON_PATH"
   fi