[automation] Build CHANGELOG

[llaville]

New Feature request

Summary

Replace legacy build CHANGELOG process by Changie tool.

Description

Legacy build CHANGELOG process suffer from a little problem that may cause git merge conflicts if it not well handled.
Using Mardown custom tags <!-- MARKDOWN-RELEASE:START --> and <!-- MARKDOWN-RELEASE:END -->

Solution

Do not use anymore the custom Markdown tags and separate changelog from commit messages without conflicts with Changie tool.

[llaville]

Already applied on bartlett/php-compatinfo-db package, for upcoming release 4.10.0 (branch 4.10) : see llaville/php-compatinfo-db#130