MeshTools: update a broken link.

src/Magnum/MeshTools/Tipsify.h

@@ -53,7 +53,7 @@ Optimizes the mesh for vertex-bound applications by rearranging its index
 array for beter usage of post-transform vertex cache. Algorithm used:
 * *Pedro V. Sander, Diego Nehab, and Joshua Barczak --- Fast Triangle Reordering
 for Vertex Locality and Reduced Overdraw, SIGGRAPH 2007,
-http://gfx.cs.princeton.edu/pubs/Sander_2007_%3ETR/index.php*.
+https://gfx.cs.princeton.edu/pubs/Sander_2007_%3eTR/tipsy.pdf*.
 @todo Ability to compute vertex count automatically
 */
 MAGNUM_MESHTOOLS_EXPORT void tipsifyInPlace(const Containers::StridedArrayView1D<UnsignedInt>& indices, UnsignedInt vertexCount, std::size_t cacheSize);