Bump up version number

Author: kinnala

README.md

@@ -209,7 +209,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 with respect to documented and/or tested features.
 
-### Unreleased
+### [9.1.1] - 2024-04-23
 
 - Fixed: Tests now pass with `numpy==2.0rc1`
 - Fixed: `MappingAffine` now uses lazy evaluation also for element

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = scikit-fem
-version = 9.0.1
+version = 9.1.1
 author = Tom Gustafsson
 description = Simple finite element assemblers
 url = https://github.com/kinnala/scikit-fem