Quick fix for guidelines

Author: Duchstf

README.md

@@ -2,6 +2,6 @@
 
 - When you add a `keras` model, please save the architecture and weights in `<model-name>.json` and `<model-name>_weights.h5` files.
 
-- If you have example **data** you want to add, please save them in `data/` with names `<model-name>_input.*` and `<model-name>_output.*`. Where `*` can either be `npy` or `dat`.
+- If you have example **data** you want to add, please save them in `data/` with names `<model-name>_input.dat` and `<model-name>_output.dat`.
 
-- If you have example **configuration** you want to add, please save them in `config-files/` with names `<model-name>_config.yml`
+- If you have example **configuration** you want to add, please save them in `config-files/` with names `<model-name>_config.yml`