Add twgit feature merge-into-hotfix

[sasux]

Could it be possible to add the possibility as for a release to add a feature intot an hotfix by a simple command line

[vchabot]

Indeed, I think it could be a good thing to merge a feature into an hotfix with a command like 'twgit feature merge-into-hotfix'.

👍

[ltoussaint]

I'm not sure it's really a good thing.
Logically, hotfix should be used to quickly fix a bug in production and should concern a unique problem.

As mentionned in the documentation : https://github.com/Twenga/twgit/wiki/Workflow#wiki-3.7.hotfix
"Un hotix ne doit concerner que quelques lignes" (it could be interesting to translate documentation in english ;) )

So, logically, we shouldn't need to merge another branch in a hotifx.

[ltoussaint]

Duplicate an old issue #3
I close the old one

[geoffroy-aubry]

@ltoussaint good job ;-)