add option to edit commit message of merges

[maeddeg]

Currently all merges are commited with a standard merge message for bugfixes, hotfixes, features etc.

it would be nice to be able to edit these messages separately for each merge (into develop and into master).

[github-actions]

Welcome!

Thank you for finding time to write an issue and help to make this extension better. I`ll appreciate if you find some time to rate this extension here.

I`ll get to this Issue ASAP.

[Serhioromano]

Unfortunately, I only build a visual interface around script that I have no power over. All parameters it accepts I, added to the process.