docs: add node.js version info

Author: Seth

TROUBLESHOOTING.md

@@ -1,3 +1,7 @@
+# Troubleshooting
+
+### `EACCESS` error
+
 If you get an `EACCESS` error, the simplest way to fix this is to rerun the command, in either of the following ways:
 
 - On unix shells, prefix the command with sudo
@@ -7,3 +11,7 @@ If you get an `EACCESS` error, the simplest way to fix this is to rerun the comm
 
 You can also fix the permissions so that you don't have to use `sudo`. Take a look at this npm documentation:
 https://docs.npmjs.com/getting-started/fixing-npm-permissions
+
+### `EEXIST` error
+
+Make sure you are using an active version of Node.js. Active versions can be found [here](https://nodejs.org/en/about/releases/).