Placeholder(s) for release notes text

[benedeki]

Background

The possibility to have patterns how the release note entries look like is great,but not all aspects are yet configurable.

Feature

Add placeholders for release note entry and releasse note entry line.
If release note entry is not present, use title instead.

Example

Template: {number} _{title}_ {developed-by}\n{release-note-entry}
#33 Simplify working with result row @benedeki

• Added function execute
• Added function resultSet

Template: _{release-note-line-entry}_ {developed-by} in {pr}
Added function execute developed by @benedeki in #34
Added function resultSet developed by @benedeki in #34