CMake/Help/release/dev/deprecate-pre-3.10.rst

deprecate-pre-3.10
------------------

* Compatibility with versions of CMake older than 3.10 is now deprecated
  and will be removed from a future version.  Calls to
  :command:`cmake_minimum_required` or :command:`cmake_policy` that set
  the policy version to an older value now issue a deprecation diagnostic.