fix: Migrate to Vrm1, set missing specVersion and licenseUrl

Assets/VRM10/Runtime/Migration/MigrationVrm.cs

@@ -63,7 +63,10 @@ namespace UniVRM10
 
             {
                 // vrm
-                var vrm1 = new UniGLTF.Extensions.VRMC_vrm.VRMC_vrm();
+                var vrm1 = new UniGLTF.Extensions.VRMC_vrm.VRMC_vrm
+                {
+                    SpecVersion = Vrm10Exporter.VRM_SPEC_VERSION
+                };
 
                 // meta (required)
                 vrm1.Meta = MigrationVrmMeta.Migrate(gltf, vrm0["meta"]);

Assets/VRM10/Runtime/Migration/MigrationVrmMeta.cs

@@ -32,6 +32,7 @@ namespace UniVRM10
         {
             var meta = new UniGLTF.Extensions.VRMC_vrm.Meta
             {
+                LicenseUrl = Vrm10Exporter.LICENSE_URL_JA,
                 AllowPoliticalOrReligiousUsage = false,
                 AllowExcessivelySexualUsage = false,
                 AllowExcessivelyViolentUsage = false,

Assets/VRM10/Runtime/Migration/MigrationVrmSpringBone.cs

@@ -184,6 +184,7 @@ namespace UniVRM10
         {
             var springBone = new VRMC_springBone
             {
+                SpecVersion = Vrm10Exporter.SPRINGBONE_SPEC_VERSION,
                 Colliders = new List<Collider>(),
                 ColliderGroups = new List<ColliderGroup>(),
                 Springs = new List<Spring>(),