Replace --show-current in drb to support older versions of Git

[salcode]

The git branch --show-current command was only introduced in Git 2.22.0, which was released 2019-06-07.

If you’re running an older version of Git, this command will fail. Instead we can use

git rev-parse --abbrev-ref HEAD

which gives the same result as git branch --show-current but is supported in much older versions of GIt.

Change to Make

We want to change git branch --show-current in this line

salcode-git/gitconfig

Line 10 in a532c81

drb = !git push origin --delete $(git branch --show-current)

and this line

salcode-git/README.md

Line 19 in a532c81

Alias for `git push origin --delete $(git branch --show-current)` to delete the remote branch with the same name as the current branch from the remote **origin**.

to git rev-parse --abbrev-ref HEAD