Added release notes for LWRP.

Added notes from 1.1.4-preview to initial tagged release.

ScriptableRenderPipeline/LightweightPipeline/CHANGELOG.md

 # Changelog
-All notable changes to this package will be documented in this file.
-The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
-and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+## [1.1.4-preview]
+### Improvements
+ - Terrain and grass shaders ported
+ - Updated materials and shader default albedo and specular color to midgrey.
+ - Exposed _ScaledScreenParams to shader. It works the same as _ScreenParams but takes pipeline RenderScale into consideration
+ - Performance Improvements in mobile
+ 
+### Bugfixes
+ - Fixed SRP Shader library issue that was causing all constants to be highp in mobile
+ - Fixed shader error that prevented LWRP to build to UWP
+ - Fixed shader compilation errors in Linux due to case sensitive includes
+ - Fixed Rendering Texture flipping issue
+ - Fixed Standard Particles shader cutout and blending modes
+ - Fixed crash caused by using projectors
+ - Fixed issue that was causing Shadow Strength to not be computed on mobile
+ - Fixed Material Upgrader issue that caused editor to SoftLocks
+ - Fixed GI in Unlit shader
+ - Fixed null reference in the Unlit material shader GUI
-## [0.1.6] - 2018-xx-yy
+## [1.1.2-preview]
+### Improvements
+ - Performance improvements in mobile  
+  
+### Bugfixes
+ - Fixed shadows on GLES 2.0
+ - Fixed CPU performance regression in shadow rendering
+ - Fixed alpha clip shadow issues
+ - Fixed unmatched command buffer error message
+ - Fixed null reference exception caused by missing resource in LWRP
+ - Fixed issue that was causing Camera clear flags was being ignored in mobile
-### Changelog starting
+## [1.1.1-preview]
+### Improvements
+ - Added Cascade Split selection UI
+ - Shadowmap uses 16bit format instead of 32bit.
+ - Added SHADER_HINT_NICE_QUALITY. If user defines this to 1 in the shader Lightweight pipeline will favor quality even on mobile platforms.
+ - Small shader performance improvements
-Started Changelog
+### Bugfixes
+ - Fixed Subtractive Mode
+ - Shadow Distance does not accept negative values anymore
+
+## [0.1.24]
+### Improvements
+ - Refactored lightweight standard shaders and shader library to improve ease of use.
+ - Added Light abstraction layer on lightweight shader library.
+ - HDR RT now uses what format is configured in Tier settings.
+ - Optimized tile LOAD op on mobile.
+ - Added HDR global setting on pipeline asset. 
+ - Added Soft Particles settings on pipeline asset.
+ - Ported particles shaders to SRP library
+ - Reduced GC pressure
+ - Reduced shader variant count by ~56% by improving fog and lightmap keywords
+ - Converted LW shader library files to use real/half when necessary.
+
+### Bugfixes
+ - Fixed realtime shadows on OpenGL
+ - Fixed shader compiler errors in GLES 2.0
+ - Fixed issue sorting issues when BeforeTransparent custom fx was enabled.
+ - Fixed VR single pass rendering.
+ - Fixed viewport rendering issues when rendering to backbuffer.
+ - Fixed viewport rendering issues when rendering to with MSAA turned off.
+ - Fixed multi-camera rendering.
+
+## [0.1.23]
+### Improvements
+ - Shaders ported to the new SRP shader library. 
+ - Constant Buffer Refactor to use new Batcher
+ - Shadow filtering and bias improved.
+ - Pipeline now updates color constants in gamma when in Gamma colorspace.
+ - UI Improvements (Rendering features not supported by LW are hidden)
+ - Optimized ALU and CB usage on Shadows.
+ - Reduced shader variant count by ~33% by improving shadow and light classification keywords
+ - Default resources were removed from the pipeline asset.
+ 
+### Bugfixes
+ - Fixed shader include path when using SRP from package manager.
+ - Fixed spot light attenuation to match Unity Built-in pipeline.
+ - Fixed depth pre-pass clearing issue.
+
+## [0.1.12]
+### Improvements
+ - Realtime shadow filtering was improved. 
+ - Standard Unlit shader now has an option to sample GI.
+ - Added Material Upgrader for stock Unity Mobile and Legacy Shaders.
+ - UI improvements
+
+### Bugfixes
+ - Fixed an issue that was including unreferenced shaders in the build.
+ - Fixed a null reference caused by Particle System component lights.
+
+## [0.1.11]
+ Initial Release.
+
+
+
+