Add note about using Node 12

client/README.md

@@ -2,21 +2,23 @@
 
 ### Setting up the project for the first time?
 
-  - From this directory, `npm run setup` to install front end dependencies and create an `.env` file
-  - get a [Mapbox](https://account.mapbox.com/auth/signin/) API token and add that to your `.env` file as the `MAPBOX_TOKEN`
-  - get the `API_URL` from a team member and add that to your `.env` file
+- Install Node 12. You can use [nvm](https://github.com/nvm-sh/nvm) to install this particular version of Node.
+- From this directory, `npm run setup` to install front end dependencies and create an `.env` file
+- get a [Mapbox](https://account.mapbox.com/auth/signin/) API token and add that to your `.env` file as the `MAPBOX_TOKEN`
+- get the `API_URL` from a team member and add that to your `.env` file
 
 Setup complete!
 
 ### Development
 
-  - From this directory, `npm start` to check your `.env` file and start webpack dev server
+- From this directory, `npm start` to check your `.env` file and start webpack dev server
 
 Your browser should open to `0.0.0.0:3000` and the site should render. Webpack will detect saved code changes, rebuild the bundle in memory, and update the site in your browser.
 
 Stop webpack dev server with `Ctrl-C`.
 
 ### Useful commands
+
 ```
 npm run setup                 # install dependencies listed in package.json and check .env file
 npm run check-env             # checks .env file exists and has all required keys