Also update changelog to describe 2.5.6

Author: mattdurak

CHANGES.txt

@@ -1,8 +1,18 @@
-Visual Leak Detector (VLD) Version 2.5.1
+Visual Leak Detector (VLD) Version 2.5.6
 
 
   Change Log / Release Notes
 
+2.5.6 (16 October 2020)
+----------------------------
+  Enhancements:
+  + Builds with Visual Studio 2019 targeting Windows 10 version 19041
+  + Installer applies settings correctly for Visual Studio 2019
+  + Call QueryVirtualMemoryInformation instead of VirtualQuery to improve performance
+
+  Bugs Fixed:
+  + Avoid false positives from C++ static initializers (now slightly more permissive to potential leaks)
+
 2.5.1 (30 January 2017)
 ----------------------------
   Enhancements:

README.md

@@ -29,6 +29,7 @@ Read the documentation at [https://github.com/KindDragon/vld/wiki](https://githu
 We encourage developers who've added their own features, or fixed bugs they've found, to contribute to the project. The full version-controlled source tree is available publicly via Git at the URL below. Feel free to clone from this URL and submit patches for consideration for inclusion in future versions. You can also issue pull requests for changes that you've made and would like to share.
 
 * [Source code](https://github.com/KindDragon/vld)
+* [Microsoft fork code](https://github.com/Azure/vld)
 
 Copyright © 2005-2017 VLD Team