Add shadergraph package

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Util/ShaderGenerator.cs

             var path2 = new List<string>
             {
                 "Packages",
-                "com.unity.render-pipelines.shadergraph",
+                "com.unity.shadergraph",
                 "Editor",
                 "Templates"
             };

MaterialGraphProject/Assets/UnityShaderEditor/package.json

+{
+    "name": "com.unity.shadergraph",
+    "description": "Shader Graph",
+    "version": "0.1.1",
+    "unity": "2018.1",
+    "dependencies": {
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/package.json.meta

+fileFormatVersion: 2
+guid: d5ac453c34e359d439de9d724772ed3d
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: