Merge pull request #10170 from hrydgard/readme-1.5

Update the README for 1.5.

README.md

@@ -18,6 +18,23 @@ For the latest source code, see [our github page](https://github.com/hrydgard/pp
 
 For build instructions and other development tutorials, see the [wiki](https://github.com/hrydgard/ppsspp/wiki).
 
+
+What's new in 1.5.0
+-------------------
+* Full Vulkan support, also for Android now. Very fast on supported devices. (#10033, #10049)
+* Smarter graphics state management, reduced CPU consumption on all backends (#9899)
+* Android: Support for Arabic and other scripts we couldn't support before
+* Fix Android widgets, screen scaling (#10145)
+* Fixes to video dumping
+* Geometry problems fixed in Medal of Honor
+* Implement immediate draws, fixing Thrillville (#7459)
+* Software rendering improvements, speed and accuracy
+* Hardware tesselation of PSP Beziers and Splines (used by a few games)
+* Partial sceUsbGps and sceUsbCam support (Android)
+* Android "Sustained performance mode" to avoid thermal throttling (#9901)
+* Linux controller mapping fixes (#9997)
+* Assorted bugfixes and compatibility improvements
+
 What's new in 1.4.2
 -------------------
 * Fixed longstanding bug causing games to crash on ARM64