Remove the note on licensing

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

README.rst

@@ -8,17 +8,6 @@ License
 
 This plugin is licensed under GPLv3.
 
-The python-omemo library being used is a reimplementation of libsignal
-in python and plans to stay away from the GPL license as possible. For
-the moment, the OMEMO library has to reuse parts of the original
-libsignal implementation, (the wireformat), which makes it GPL. Efforts
-are being made in order to not have to reuse these libsignal bits, and
-move to a more permissive license.
-
-As long as this is not the case, this plugin will stay GPLv3 as well,
-and it will not be possible to merge it without changing Slixmpp's
-license itself.
-
 Note on the underlying OMEMO library
 ------------------------------------