Update specification and reference to v1.0 (#214)

index.html

@@ -4,7 +4,7 @@
 
 **OpenPBR Surface**
 
-<center>*Specification v0.5, 2024-05-14. &nbsp; &nbsp; <a href="https://github.com/AcademySoftwareFoundation/OpenPBR" title="Redirect to GitHub page"><img src="images/aswf-logo-black.svg" alt="homepage" height="18" style="vertical-align: middle; position: relative; bottom: 3px"/></a> *</center>
+<center>*Specification v1.0, 2024-06-04. &nbsp; &nbsp; <a href="https://github.com/AcademySoftwareFoundation/OpenPBR" title="Redirect to GitHub page"><img src="images/aswf-logo-black.svg" alt="homepage" height="18" style="vertical-align: middle; position: relative; bottom: 3px"/></a> *</center>
 
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 This document is a specification of a surface shading model intended as a standard for computer graphics: the OpenPBR Surface model. Designed as an über-shader, it aims to be capable of accurately modeling the vast majority of CG materials used in practical visual effects and feature animation productions. The model has been developed as a synthesis of the Autodesk Standard Surface and the Adobe Standard Material models.

reference/open_pbr_surface.mtlx

@@ -3,7 +3,7 @@
   <!--
     OpenPBR Surface node definition
   -->
-  <nodedef name="ND_open_pbr_surface_surfaceshader" node="open_pbr_surface" nodegroup="pbr" version="0.5" isdefaultversion="true"
+  <nodedef name="ND_open_pbr_surface_surfaceshader" node="open_pbr_surface" nodegroup="pbr" version="1.0" isdefaultversion="true"
            doc="OpenPBR Surface Shading Model" uiname="OpenPBR Surface">
     <input name="base_weight" type="float" value="1.0" uimin="0.0" uimax="1.0" uiname="Base Weight" uifolder="Base"
            doc="Multiplier on the intensity of the reflection from the diffuse and metallic base." />