[Docs] [Fix] zsh autochange: only `nvm install` if we can’t `nvm use`

README.markdown

@@ -322,8 +322,10 @@ load-nvmrc() {
   if [ -n "$nvmrc_path" ]; then
     local nvmrc_node_version=$(nvm version "$(cat "${nvmrc_path}")")
 
-    if [ "$nvmrc_node_version" != "N/A" ] && [ "$nvmrc_node_version" != "$node_version" ]; then
+    if [ "$nvmrc_node_version" = "N/A" ]; then
       nvm install
+    elif [ "$nvmrc_node_version" != "$node_version" ]; then
+      nvm use
     fi
   elif [ "$node_version" != "$(nvm version default)" ]; then
     echo "Reverting to nvm default version"