Bump version to 1.9.1

Author: goodmami

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ### Unreleased
 
+
+## [v1.9.1]
+
+**Release date: 2023-12-19**
+
 ### Fixed
 
 * Properly define `delphin` command in pyproject.toml ([#386])
@@ -1445,6 +1450,7 @@ There was no CHANGELOG file prior to this release, so I don't have much
 information about changes, except for
 [commit messages](../../commits/v0.2).
 
+[v1.9.1]: ../../releases/tag/v1.9.1
 [v1.9.0]: ../../releases/tag/v1.9.0
 [v1.8.1]: ../../releases/tag/v1.8.1
 [v1.8.0]: ../../releases/tag/v1.8.0

delphin/__about__.py

@@ -3,7 +3,7 @@
 # the warehouse project:
 #   https://github.com/pypa/warehouse/blob/master/warehouse/__about__.py
 
-__version__ = '1.9.0'
+__version__ = '1.9.1'
 __version_info__ = __version__.replace('.', ' ').replace('-', ' ').split()
 
 __title__ = 'PyDelphin'