Map of user replacements

[benedeki]

Background

Autoreplacemets can greatly simplify the work of the release notes creator, and improve the quality of generated release notes.

Feature

Add a setting, which would be a map string->string. Each key occurence in the release notes entry would be replaced by its value in the draft

Example usage

Contributor's name replaced for their GitHub handle
David Benedeki->@benedeki
Commonly mentioned projects or sites linked
Fa-DB->[Fa-Db](https://github.com/AbsaOSS/fa-db)