CodeCoverage.cmake does not show the comments of the cutom_command

[hippo91]

Hi,

first of all thanks a lot for your work. It spares me a lot of time!

I'm using the CodeCoverage.cmake script and it works very well but the message associated with custom targets are not printed.
I'm working with CMake version 3.22.1.

I solved this by replacing the comment with:

      COMMAND ${CMAKE_COMMAND} -E echo "Lcov code coverage info report saved in ${Coverage_NAME}.info."

Do you want a PR for this?

[Darwin-Li-001]

Can you please how to use this? for the user guide is not useful to a newer of CMake. Thanks!