README.md: Update Arch instructions (#624)
README.md: Update Arch instructions (#624)

- Change 'sync-deps' to 'syncdeps'
- Add clang-tidy-4.0 symlink
Bareflank/hypervisor,rianquinn/hypervisor,connojd/hypervisor,connojd/hypervisor,rianquinn/hypervisor,Bareflank/hypervisor,rianquinn/hypervisor,Bareflank/hypervisor,connojd/hypervisor