Allow custom commit prefix

[jineshqa]

Something that many companies use to track commits related to a Jira ticket would also be helpful. For example, our commit messages looks like this,

APT-1234: Commit message

Here is APT-1234 is the ticket number.

Thanks in advance, Jinesh

[RomanHotsiy]

Dup of https://github.com/RomanHotsiy/commitgpt/issues/10