scripts: add update_changelog.py

Add a simple helper script that makes the tedious and slightly error
prone update process easier and more stable.

Usage example:
$ ./scripts/update_changelog.py -

scripts: add update_changelog.py

Add a simple helper script that makes the tedious and slightly error
prone update process easier and more stable.

Usage example:
$ ./scripts/update_changelog.py --changelog-file CHANGELOG.md \
--release-version 3.7.0 --previous-release-version 3.6.0 \
--release-date 2019-10-18

Signed-off-by: Joakim Bech <joakim.bech@linaro.org>
Acked-by: Jerome Forissier <jerome@forissier.org>

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