DOC add whats new 0.9.1

Author: glemaitre

doc/whats_new/v0.9.rst

@@ -1,10 +1,19 @@
 .. _changes_0_9:
 
+Version 0.9.1
+=============
+
+Changelog
+---------
+
+This release provides fixes that make `imbalanced-learn` works with the
+latest release (`1.1.0`) of `scikit-learn`.
+
 Version 0.9.0
 =============
 
 Changelog
 ---------
 
-This release is mainly providing fixes that make `imbalaned-learn` works
-with the latest release (`1.0.2`) of scikit-learn.
+This release is mainly providing fixes that make `imbalanced-learn` works
+with the latest release (`1.0.2`) of `scikit-learn`.