Change "open groups" -> "communities" in readme

But don't rename the package.

Author: jagerman

README.md

@@ -1,9 +1,9 @@
-# PySOGS (Python Session Open Group Server)
+# PySOGS (Session Community Server)
 
-PySOGS is the reference implementation of a Session open group server, written in Python. PySOGS is
-used to run the official Session open group, and is the officially supported open group server.  New
-features added to Session open groups are developed here in lockstep with the support added to the
-Session clients.
+PySOGS is the reference implementation of a Session Community server (formerly known as a Session
+Open Group). PySOGS is used to run the official Session Communities, and is the officially supported
+Session Community server.  New features added to Session Communities are developed here in lockstep
+with the support added to the Session clients.
 
 ## Installation
 
@@ -26,7 +26,7 @@ For how to administer a running PySOGS see [SOGS Administration](administration.
 
 ## License
 
-Copyright (c) 2021 The Oxen Project
+Copyright (c) 2022 The Oxen Project
 
 PySOGS is licensed under the [GNU General Public License (GPL) v3](LICENSE.txt), or (at your option)
 any later version.