Update setup.py and CHANGELOG.md for 0.3.26 relase

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>

Author: davidplowman

CHANGELOG.md

@@ -6,6 +6,20 @@
 
 ### Changed
 
+## 0.3.26 Beta Release 25
+
+### Added
+
+* New SplittableOutput, allows switching between other outputs seamlessly at I frames.
+* Support for PySide2, PySide6 and PyQt6 widgets.
+
+### Changed
+
+* YUV420 format can be encoded directly to JPEG now, which uses less memory and is faster.
+* Support DRM displays when XB24 is not available.
+* Fix V4L2 encoder lock-up when a frame produces no output.
+* Ongoing improvements to type hints.
+
 ## 0.3.25 Beta Release 24
 
 ### Added

setup.py

@@ -11,7 +11,7 @@
 
 setup(
     name='picamera2',
-    version='0.3.25',
+    version='0.3.26',
     description='The libcamera-based Python interface to Raspberry Pi cameras, based on the original Picamera library',
     long_description=long_description,
     long_description_content_type='text/markdown',