Update INSTALL.md (#155)

configuration folder apparently

INSTALL.md

@@ -66,7 +66,7 @@ Start a Docker container from the Docker image :
 docker run -it -v PATH_TO_THE_REPOSITORY:/home/neuro/code/ nipype/nipype
 ```
 
-Optionally edit the configuration file `narps_open/utils/default_config.toml` so that the referred paths match the ones inside the container. E.g.: if using the previous command line, the `directories` part of the configuration file should be :
+Optionally edit the configuration file `narps_open/utils/configuration/default_config.toml` so that the referred paths match the ones inside the container. E.g.: if using the previous command line, the `directories` part of the configuration file should be :
 ```toml
 # default_config.toml
 # ...