Bumped up the version

Author: agronholm

docs/versionhistory.rst

@@ -3,7 +3,7 @@ Version history
 
 This library adheres to `Semantic Versioning 2.0 <http://semver.org/>`_.
 
-**UNRELEASED**
+**4.12.1**
 
 - Changed all functions currently raising the private ``NoCurrentAsyncBackend``
   exception (since v4.12.0) to instead raise the public ``NoEventLoopError`` exception