Update version for next release.

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).
 
+## [3.4.0]
+
 ## [3.3.0]
 
 ## [3.2.0]

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

 {
     "name": "com.unity.render-pipelines.core",
     "description": "Core library for Unity render pipelines.",
-    "version": "3.3.0-preview",
+    "version": "3.4.0-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).
 
+## [3.4.0-preview]
+
 ## [3.3.0-preview]
 
 ### Added

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

 {
     "name": "com.unity.render-pipelines.high-definition",
     "description": "HD Render Pipeline for Unity.",
-    "version": "3.3.0-preview",
+    "version": "3.4.0-preview",
-        "com.unity.render-pipelines.core": "3.3.0-preview",
-        "com.unity.shadergraph": "3.3.0-preview"
+        "com.unity.render-pipelines.core": "3.4.0-preview",
+        "com.unity.shadergraph": "3.4.0-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).
 
+## [3.4.0-preview]
+
 ## [3.3.0-preview]
 ### Added
 - Add callbacks to LWRP that can be attached to a camera (IBeforeCameraRender, IAfterDepthPrePass, IAfterOpaquePass, IAfterOpaquePostProcess, IAfterSkyboxPass, IAfterTransparentPass, IAfterRender)

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

 {
     "name": "com.unity.render-pipelines.lightweight",
     "description": "Lightweight Render Pipeline for Unity.",
-    "version": "3.3.0-preview",
+    "version": "3.4.0-preview",
-        "com.unity.render-pipelines.core": "3.3.0-preview",
-        "com.unity.shadergraph": "3.3.0-preview"
+        "com.unity.render-pipelines.core": "3.4.0-preview",
+        "com.unity.shadergraph": "3.4.0-preview"
     }
 }

com.unity.shadergraph/CHANGELOG.md

+## [3.4.0]
+
 ## [3.3.0]
 
 ## [3.2.0]

com.unity.shadergraph/package.json

 {
     "name": "com.unity.shadergraph",
     "description": "Shader Graph",
-    "version": "3.3.0-preview",
+    "version": "3.4.0-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).
 
+## [3.4.0]
+
 ## [3.3.0]
 
 ## [3.2.0]

com.unity.testframework.graphics/package.json

 {
 	"name": "com.unity.testframework.graphics",
 	"displayName":"Graphics Tests Framework",
-	"version": "3.3.0-preview",
+	"version": "3.4.0-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"],

com.unity.testing.srp.core/package.json

 {
 	"name": "com.unity.testing.srp.core",
 	"displayName":"Core Graphics Tests",
-	"version": "3.3.0-preview",
+	"version": "3.4.0-preview",
-        "com.unity.render-pipelines.core" : "3.3.0-preview"
+        "com.unity.render-pipelines.core" : "3.4.0-preview"
 	}
 }

com.unity.testing.srp.lightweight/package.json

 {
 	"name": "com.unity.testing.srp.lightweight",
 	"displayName":"Lightweight Graphics Tests",
-	"version": "3.3.0-preview",
+	"version": "3.4.0-preview",
-        "com.unity.render-pipelines.lightweight" : "3.3.0-preview",
-        "com.unity.testframework.graphics" : "3.3.0-preview"
+        "com.unity.render-pipelines.lightweight" : "3.4.0-preview",
+        "com.unity.testframework.graphics" : "3.4.0-preview"
 	}
 }