Add branch alias to master on Composer's file

[henriquemoody]

No description provided.

[mnapoli]

I'm definitely going to forget about this later ;)

[henriquemoody]

I have a kind of process when I release some minor/major version.

• Create a branch to version, like x.y
• Create a tag to version, like x.y.0
• Update the branch alias on master branch to the next minor version

It's been working for me, I never forget, yet, but surely may happens. 😝

[mnapoli]

I am not used to this yet ;)