Update README.md

README.md

@@ -21,7 +21,7 @@ provided script
 ```
 This will download the `container.sif` file (~1Gb) in the current working 
 directory.
-An automated download script via the Neurobot-API is provided but require
+An automated download script via the Neurobot-API is provided but requires
 that the Neurobot username and API token are available as environment variables
 ```bash
 export NEUROBOT_USR=[your-neurobot-username]