Updated readme

README.md

@@ -60,9 +60,9 @@ GovUK styles and JS taken from static assets generated by the [X-GovUK Eleventy
     Start this site by ensuring at least [Node 16.15.0](https://nodejs.org/en/blog/release/v16.15.0/) is installed. You can do this using [Node Version Manager (NVM)](https://tecadmin.net/install-nvm-macos-with-homebrew/) and following the following instructions:
     ```shell
     # Use Node Version Manager to install Node v16.15.0 (latest LTS version)
-    nvm install 16.15.0
+    nvm install 18
     # Then use Node v16.15.0 before installing project dependencies
-    nvm use 16.15.0
+    nvm use 18
     # If yarn is not installed run the following to globally install it
     npm i yarn -g
     # Install project dependencies