Update Unity version from 5.6.7f1 to 2018.4.23f1

Assets/VRM/UniGLTF/Resources/Shaders/StandardVColor.shader

@@ -1,4 +1,6 @@
-Shader "UniGLTF/StandardVColor" {
+// Upgrade NOTE: upgraded instancing buffer 'Props' to new syntax.
+
+Shader "UniGLTF/StandardVColor" {
 	Properties {
 		_Color ("Color", Color) = (1,1,1,1)
 		_MainTex ("Albedo (RGB)", 2D) = "white" {}
@@ -30,9 +32,9 @@
 		// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
 		// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
 		// #pragma instancing_options assumeuniformscaling
-		UNITY_INSTANCING_CBUFFER_START(Props)
+		UNITY_INSTANCING_BUFFER_START(Props)
 			// put more per-instance properties here
-		UNITY_INSTANCING_CBUFFER_END
+		UNITY_INSTANCING_BUFFER_END(Props)
 
 		void vert(inout appdata_full v, out Input o){
 			UNITY_INITIALIZE_OUTPUT(Input, o);

ProjectSettings/ProjectVersion.txt

@@ -1 +1 @@
-m_EditorVersion: 5.6.7f1
+m_EditorVersion: 2018.4.23f1