Update installation section of client readme

Author: b0l0k

client/README.md

@@ -3,23 +3,6 @@
 This package allows to communicate with the Ledger Ethereum application, either on a
 real device, or emulated on Speculos.
 
-## Installation
-
-This package is deployed:
-
-- on `pypi.org` for the stable version. This version will work with the
-  application available on the `master` branch.
-
-  ```bash
-  pip install ledger_app_clients.ethereum
-  ```
-- on `test.pypi.org` for the rolling release. This version will work with the
-  application available on the `develop` branch.
-
-  ```bash
-  pip install --extra-index-url https://test.pypi.org/simple/ ledger_app_clients.ethereum
-  ```
-
 ### Installation from sources
 
 You can install the client from this repo: