Added CHANGELOG for v1.9.1 release
+Version 1.9.1
+=============
+
+This release is a minor bug fix release patching various issues
+which were found in the 1.9.0 release.
+
+Enhancements:
+
+- Exposed min_alpha parameter on datashader shade and datashade
+ operations ([\#2109](https://github.com/ioam/holoviews/pull/2109))
+
+Fixes:
+
+- Fixed broken bokeh server linked stream throttling
+ ([\#2112](https://github.com/ioam/holoviews/pull/2112))
+- Fixed bug in bokeh callbacks preventing linked streams using
+ bokeh's on_event callbacks from working
+ ([\#2112](https://github.com/ioam/holoviews/pull/2112))
+- Fixed insufficient validation issue for Image and bugs when
+ applying regrid operation to xarray based Images
+ ([\2117](https://github.com/ioam/holoviews/pull/2117))
+- Fixed handling of dimensions and empty elements in univariate_kde
+ and bivariate_kde operations
+ ([\#2103](https://github.com/ioam/holoviews/pull/2103))
+
Version 1.9.0
=============
