make_a_release.sh: suggest announcement e-mail

make_a_release.sh: suggest announcement e-mail

The 'make_a_release.sh' script appears to be extremely useful - I do not
forget things as I used to anymore (amending Makefile, signing, uploading
to the FTP server, etc). It is very useful that it suggest me exact commands
which I may just copy-past to my command line.

This patch improves the script and makes it suggest the e-mail announcement
which I may just copy-paste to my command line and the announcement will
be sent using 'git send-email' command. It will include all the interested
parties in CC.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>