added code type

Author: rusty1s

README.md

@@ -39,7 +39,7 @@ Check that `nvcc` is accessible from terminal, e.g. `nvcc --version`.
 If not, add cuda (`/usr/local/cuda/bin`) to your `$PATH`.
 Then run:
 
-```
+```sh
 pip install cffi torch-scatter
 ```