Trivial patches with minor corrections on README's

Hi there, Please consider applying these three patches (in attachment) that provide very minor corrections in the README's of three different repositories (libgnunetchat, messenger-cli and messenger-gtk). Best regards, -- Marcos Marado From 7142d23c063a5cf1ba70c83d569defca764cfb4b Mon Sep 17

GNUnet 0.15.0 released

We are pleased to announce the release of GNUnet 0.15.0. This is a new major release. It breaks protocol compatibility with the 0.14.x versions. Please be aware that Git master is thus henceforth INCOMPATIBLE with the 0.14.x GNUnet network, and interactions between old and new peers will result