add test to html file

test/unit/unittests_three.html

@@ -28,6 +28,7 @@
   <script src="core/InterleavedBuffer.js"></script>
   <script src="core/InterleavedBufferAttribute.js"></script>
 
+  <script src="core/Face3.js"></script>
   <script src="core/Geometry.js"></script>
   <script src="core/BufferAttribute.js"></script>
   <script src="core/BufferGeometry.js"></script>