update HISTORY.rst

Author: lilypan26

src/aks-preview/HISTORY.rst

@@ -12,6 +12,10 @@ To release a new version, please select a new version number (usually plus 1 to
 Pending
 +++++++
 
+19.0.0b19
++++++++
+* Add option `--gpu-driver` to `az aks nodepool update` to select skipping GPU driver installation.
+
 19.0.0b18
 +++++++
 * Vendor new SDK and bump API version to 2025-10-02-preview.