pip install code labelled as shell

easy_my_coop/description.rst

@@ -8,11 +8,10 @@ python -m venv venv
 And then pip-install them [from pypi](https://pypi.org/user/coopdevs/).
 
 ### Example
-For instance, for the addon `easy_my_coop_website_portal`
 
-```
+For instance, for the addon `easy_my_coop_website_portal`
+```shell
 pip install odoo12-addon-easy-my-coop-website-portal==12.0.1.0.0.99.dev9
 ```
-
 Beware that for word separation, pypi uses dashes `-` and odoo underscores `_`.