Update package version for real <next>

com.unity.render-pipelines.core/CHANGELOG.md

 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).
 
-## [Unreleased]
+## [3.1.0]
 
 ### Added
 - Add PCSS shadow filter

com.unity.render-pipelines.core/package.json

 {
     "name": "com.unity.render-pipelines.core",
     "description": "Core library for Unity render pipelines.",
-    "version": "3.0.1-preview",
+    "version": "3.1.0-preview",
     "unity": "2018.3",
     "displayName": "Render Pipeline Core Library"
 }

com.unity.render-pipelines.high-definition/CHANGELOG.md

 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).
 
-## [unreleased]
-
-## [3.0.1-preview]
+## [3.1.0-preview]
 
 ### Added
 - Decal now support per channel selection mask. There is now two mode. One with BaseColor, Normal and Smoothness and another one more expensive with BaseColor, Normal, Smoothness, Metal and AO. Control is on HDRP Asset. This may require to launch an update script for old scene: 'Edit/Render Pipeline/Single step upgrade script/Upgrade all DecalMaterial MaskBlendMode'.

com.unity.render-pipelines.high-definition/package.json

 {
     "name": "com.unity.render-pipelines.high-definition",
     "description": "HD Render Pipeline for Unity.",
-    "version": "3.0.1-preview",
+    "version": "3.1.0-preview",
-        "com.unity.render-pipelines.core": "3.0.1-preview",
-        "com.unity.shadergraph": "3.0.1-preview"
+        "com.unity.render-pipelines.core": "3.1.0-preview",
+        "com.unity.shadergraph": "3.1.0-preview"
     }
 }

com.unity.render-pipelines.lightweight/CHANGELOG.md

 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).
 
-## [3.0.1-preview]
+## [3.1.0-preview]
 
 ## [3.0.0-preview]
 ### Added

com.unity.render-pipelines.lightweight/package.json

 {
     "name": "com.unity.render-pipelines.lightweight",
     "description": "Lightweight Render Pipeline for Unity.",
-    "version": "3.0.1-preview",
+    "version": "3.1.0-preview",
-        "com.unity.render-pipelines.core": "3.0.1-preview",
-        "com.unity.shadergraph": "3.0.1-preview"
+        "com.unity.render-pipelines.core": "3.1.0-preview",
+        "com.unity.shadergraph": "3.1.0-preview"
     }
 }

com.unity.shadergraph/CHANGELOG.md

-# Next version
+## [3.1.0]
 
 ### HD Render Pipeline support
 

com.unity.shadergraph/package.json

 {
     "name": "com.unity.shadergraph",
     "description": "Shader Graph",
-    "version": "3.0.1-preview",
+    "version": "3.1.0-preview",
     "unity": "2018.3",
     "displayName": "Shader Graph",
     "dependencies": {

com.unity.testframework.graphics/CHANGELOG.md

 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).
 
+## [3.1.0]
+
 ## [0.1.0] - 2018-05-04
 
 ### This is the first release of *Unity Package com.unity.testframework.graphics*.

com.unity.testframework.graphics/package.json

 {
 	"name": "com.unity.testframework.graphics",
 	"displayName":"Graphics Tests Framework",
-	"version": "3.0.1-preview",
+	"version": "3.1.0-preview",
 	"unity": "2018.3",
 	"description": "Provides test framework helpers for writing tests for graphics code, such as image comparison assertions and automatic management of reference images.",
 	"keywords": ["qa", "test", "testing", "tests", "graphics"],