update version

Author: juanbe

src/aks-preview/HISTORY.rst

@@ -12,14 +12,17 @@ To release a new version, please select a new version number (usually plus 1 to
 Pending
 +++++++
 
+18.0.0b40
+++++++
+* Fix `--localdns-config` parameter to handle null values in JSON configuration files gracefully, preventing crashes when DNS override sections are null.
+
 18.0.0b39
 +++++++
 * Add option `AzureLinuxOSGuard` and `AzureLinux3OSGuard` to `--os-sku` for `az aks nodepool add` and `az aks nodepool update`.
 * Add machine command `az aks machine add` to add a machine to an existing machine pool.
 * Add blue-green upgrade strategy support for AKS node pools:
   - `az aks nodepool add/update/upgrade`: Add `--upgrade-strategy` parameter to switch between rolling and blue-green nodepool upgrades. 
   - `az aks nodepool add/update/upgrade`: Add `--drain-batch-size`, `--drain-timeout-bg`, `--batch-soak-duration`, `--final-soak-duration` parameters to configure blue-green upgrade settings.
-* Fix `--localdns-config` parameter to handle null values in JSON configuration files gracefully, preventing crashes when DNS override sections are null.
 
 18.0.0b38
 +++++++

src/aks-preview/setup.py

@@ -9,7 +9,7 @@
 
 from setuptools import find_packages, setup
 
-VERSION = "18.0.0b39"
+VERSION = "18.0.0b40"
 
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",