Release 5.15.0

@5.15.0

Features

• [#499] Create a Rubocop cop for ordering instructions in class (e.g. Models) by @Goose97 in #509

Chores

• [#460] Revisit and set the default value for some environment variables by @sanG-github in #511

Bugs

n/a

Full Changelog: 5.14.0...5.15.0