CHANGELOG.md in node_mutation-1.9.0 vs CHANGELOG.md in node_mutation-1.9.1

@@ -1,6 +1,10 @@
 # NodeMutation
 
+## 1.9.1 (2023-02-10)
+
+* Make sure `tab_width` is an Integer
+
 ## 1.9.0 (2023-02-08)
 
 * Configure `tab_width`
 * Make use of `NodeMutation.tab_width`