Merge pull request #9469 from hrydgard/readme-1.4

Update README.md for 1.4

README.md

@@ -18,6 +18,21 @@ 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 1.4.0
+-------------------
+* Support D3D11 (performs better than OpenGL or D3D9 on most hardware)
+* Audio quality improvement (linear interpolation) (#8950)
+* Hardware spline/bezier tesselation in OpenGL, D3D11 and Vulkan (...)
+* Post-processing shaders in D3D11
+* Prescale UV setting removed, now the default (improves perf) (#9176)
+* High DPI display fixes
+* New audio setting to improve compatibility with Bluetooth headsets
+* Various desktop gamepad compatibility fixes
+* Workaround for mipmap issue, fixing fonts in Tactics Ogre Japanese
+* Assorted minor compatibility fixes, code cleanup and performance improvements
+
+Support for Symbian, Maemo and Blackberry has been removed.
+
 What's new in 1.3.0
 -------------------
 * Fix JIT problems on Galaxy S7 and iOS 9+ devices. (#8965, #8937)