VR Scene Inspection: Bump version number to 0.9

For the final 2.90 release this should go up to 1.0, but not doing that
yet as we may have to do some fixes still.

viewport_vr_preview.py

@@ -38,8 +38,8 @@ from bpy.app.handlers import persistent
 bl_info = {
     "name": "VR Scene Inspection",
     "author": "Julian Eisel (Severin), Sebastian Koenig",
-    "version": (0, 2, 0),
-    "blender": (2, 83, 0),
+    "version": (0, 9, 0),
+    "blender": (2, 90, 0),
     "location": "3D View > Sidebar > VR",
     "description": ("View the viewport with virtual reality glasses "
                     "(head-mounted displays)"),