Update package versions

ScriptableRenderPipeline/Core/package.json

 {
     "name": "com.unity.render-pipelines.core",
     "description": "Core library for Unity render pipelines.",
-    "version": "1.0.0-beta",
+    "version": "1.1.1-preview",
     "unity": "2018.1",
     "dependencies": {
         "com.unity.postprocessing": "2.0.2-preview"

ScriptableRenderPipeline/HDRenderPipeline/package.json

 {
     "name": "com.unity.render-pipelines.high-definition",
     "description": "HD Render Pipeline for Unity.",
-    "version": "1.0.0-beta",
+    "version": "1.1.1-preview",
-        "com.unity.render-pipelines.core": "1.0.0-beta"
+        "com.unity.render-pipelines.core": "1.1.1-preview"
     }
 }

ScriptableRenderPipeline/LightweightPipeline/package.json

     "name": "com.unity.render-pipelines.lightweight",
     "description": "Lightweight Render Pipeline for Unity.",
     "dependencies": {
-        "com.unity.shadergraph": "1.0.0-beta",
+        "com.unity.shadergraph": "1.1.1-preview",
-        "com.unity.render-pipelines.core": "1.0.0-beta"
+        "com.unity.render-pipelines.core": "1.1.1-preview"
-    "version": "1.0.0-beta",
+    "version": "1.1.1-preview",
     "unity": "2018.1"
 }

ScriptableRenderPipeline/LightweightPipeline/sub-package.json

         "com.unity.render-pipelines.core"
     ],
     "dependencies": {
-        "com.unity.shadergraph": "1.0.0-beta"
+        "com.unity.shadergraph": "1.1.1-preview"
     }
 }

ScriptableRenderPipeline/master-package.json

 {
-    "version": "1.0.0-beta",
+    "version": "1.1.1-preview",
     "unity": "2018.1",
     "dependencies": {
         "com.unity.postprocessing": "2.0.2-preview"