updated TODO list on landing page

README.md

@@ -65,7 +65,6 @@ This project is quite small, so here is your chance to boost open-source to the
 
 - [ ] code review the model to extend compass for new compilers/platforms/OSes
 - [ ] code review the model to extend compass for new features
-- [ ] contribute adding detection of the cache hierarchy and associated cache sizes on x86 
 - [ ] is thread-safety an issue of the current implementation ?
 - [ ] contribute for adding Intel compiler on x86
 - [ ] contribute for GPUs (nvcc)