README: Add note about experimental state, recommend master

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

README.rst

@@ -6,16 +6,9 @@ distributed separately for licensing reasons.
 
 This plugin is very much **alpha**. It handles encryption and decryption
 of OMEMO messages, but doesn't display the encryption state of messages,
-and neither does it have a way to do trust management.
-
-Use in poezio
--------------
-
-Once installed (see the `Installation`_ section below), you can add
-`omemo` in the `plugin_autoload` configuration. See the Poezio
-`documentation
-<https://doc.poez.io/plugins/index.html#plugin-autoload>`_ for more
-information about autoloading plugins.
+and neither does it have a way to do trust management. As this plugin is
+still changing often, it is recommended that users follow experimental
+(master) versions of this project and its dependencies.
 
 License
 -------
@@ -35,8 +28,21 @@ Please take this into consideration when using this library.
 Installation
 ------------
 
+As this plugin is still changing often, it is recommended that users
+follow experimental (master) versions of this project and its
+dependencies.
+
 - ArchLinux (AUR):
    `python-poezio-omemo <https://aur.archlinux.org/packages/python-poezio-omemo>`_, or
    `python-poezio-omemo-git <https://aur.archlinux.org/packages/python-poezio-omemo-git>`_
 - PIP: `poezio-omemo`
 - Manual: `python3 setup.py install`
+
+Use in poezio
+-------------
+
+Once installed (see the `Installation`_ section below), you can add
+`omemo` in the `plugin_autoload` configuration. See the Poezio
+`documentation
+<https://doc.poez.io/plugins/index.html#plugin-autoload>`_ for more
+information about autoloading plugins.