README: fix pip package name

README.md

@@ -36,7 +36,7 @@ Sourcetrail can be installed using [its last release](https://github.com/CoatiSo
 Pyrrha requires a Python version >= 3.10.
 It is recommended to install the Python package inside a virtualenv. You can use `pip` to install it.
 ```python
-pip install pyrrha-project
+pip install pyrrha-mapper
 ```
 If you prefer using sources to install Pyrrha, do the following:
 ```commandline