modified the year in client information in handshake.py + ver bump

CHANGELOG.md

@@ -2,7 +2,6 @@ The changelog is kept as [release notes](https://github.com/smok-serwis/coolamqp
 on GitHub. This file serves to only note what changes
 have been made so far, between releases.
 
-# v1.2.15
+# v1.2.16
 
-* replaced `python-prctl` with `setproctitle` thanks to the latter
-  having less fascist license (BSD vs GNU GPL v3)
+* modified the year in client information in handshake.py

coolamqp/__init__.py

-__version__ = '1.2.15'
+__version__ = '1.2.16a1'

coolamqp/uplink/handshake.py

@@ -30,7 +30,7 @@ CLIENT_DATA = [
     # these fields to be of type short-string
     (b'product', (b'CoolAMQP', 'S')),
     (b'version', (__version__.encode('utf8'), 'S')),
-    (b'copyright', (b'Copyright (C) 2016-2020 SMOK sp. z o.o.', 'S')),
+    (b'copyright', (b'Copyright (C) 2016-2021 SMOK sp. z o.o.', 'S')),
     (
         b'information', (
             b'Licensed under the MIT License.\nSee https://github.com/smok-serwis/coolamqp for details',