Update changelog

Author: rsnitsch

docs/source/changelog.rst

@@ -1,10 +1,10 @@
 Changelog
 =========
 
-Version 1.NEXT
---------------
+Version 1.1.0
+-------------
 
-*Release date: tbd*
+*Release date: 2022/03/18*
 
 * added: **multithreading** for much faster torrent creation (about 30-40% faster). The number of threads can be controlled with the new ``--threads`` option. It defaults to using 4 threads which will be a good choice on most systems.
 * added: ``--version`` command