[ci skip] Update changelog to 2.0.0-rc5

changelog.md

-# Next
+# 2.0.0-rc5
 - [BUG] Fixed issue with subquery creating `include.where` and a paranoid main model.#2749/#2769
 - [BUG] Fixed issue with subquery creating `include.where` and a paranoid main model.#2749/#2769
 - UniqueConstraintErrors will now extend from ValidationError making it possible to catch both with `.catch(ValidationError)`
 - UniqueConstraintErrors will now extend from ValidationError making it possible to catch both with `.catch(ValidationError)`
 - [FEATURE] Adds `{save: false}` for belongsTo relationship setters. `user.setOrganization(organization, {save: false})` will then only set the foreign key value, but not trigger a save on `user`.
 - [FEATURE] Adds `{save: false}` for belongsTo relationship setters. `user.setOrganization(organization, {save: false})` will then only set the foreign key value, but not trigger a save on `user`.