Update README with dependancies

README.md

@@ -22,7 +22,14 @@ generate a complete HTML documentation that will be available in the *./doc/html
 See requirements.txt
 
 You may need to install some dev libraries like `libmysqlclient-dev`, `libssl-dev`, `libjpeg-dev`, or `zlib1g-dev` to install all the
-requiered dependancies with pip. You may also need `mysql-client`.
+requiered dependancies with pip. You may also need `mysql-client`. Don't also forget `python3-dev` if you don't have it
+already.
+
+You can check all of them with:
+
+```
+sudo apt install libmysqlclient-dev libssl-dev libjpeg-dev zlib1g-dev python3-dev
+```
 
 The development is done with sqlite, but it is advised to set a more robust DBMS for production (Postgresql for example)