#17 Pre-Check if all branches extists

[derenix]

#17

If configured, this checks for the existence of all given branches before creating a RC. If 1 or more branches can't be found in the current repository, all non-existing branches will be listed.

The output looks like this:

[?] Trying branch affe
[+] Calling: git ls-remote --heads origin affe
c94d8e697df9f319e896fd7fbe543d93bcd3488c	refs/heads/affe

[?] Trying branch i-dont-exists
[+] Calling: git ls-remote --heads origin i-dont-exists

[?] Trying branch typo-in-branch-name
[+] Calling: git ls-remote --heads origin typo-in-branch-name

[-] Uh-oh! The following branches does not exists:
[-]	'i-dont-exists'
[-]	'typo-in-branch-name'
[-] Error: Non existing branches found.